diff --git a/src/views/contract/components/splitContract.vue b/src/views/contract/components/splitContract.vue
index 1437e18..ba4dbc3 100644
--- a/src/views/contract/components/splitContract.vue
+++ b/src/views/contract/components/splitContract.vue
@@ -1,21 +1,45 @@
 <template>
   <div>
-    <Modal width="720" v-model="isShow" :title="modalTitle" @on-ok="submit">
-      <div style="margin-bottom: 10px;display: flex;justify-content: space-between;align-items: center;">
+    <Modal width="720" v-model="isShow" :title="modalTitle" :footer-hide="true">
+      <div class="modal-toolbar">
         <span>源项目：{{ row.name }}</span>
-        <el-button type="primary" icon="el-icon-plus" size="small" @click="addSection">新增标段</el-button>
+        <div class="modal-toolbar-actions">
+          <el-button
+            v-if="isContinueMode && existingSections.length"
+            size="small"
+            @click="toggleEditSectionNo"
+          >{{ isEditingSectionNo ? '取消编辑' : '编辑标段' }}</el-button>
+          <el-button type="primary" icon="el-icon-plus" size="small" @click="addSection">新增标段</el-button>
+        </div>
       </div>
 
       <div v-if="existingSections.length" class="existing-sections">
-        <div class="existing-sections-title">已拆分标段（不可修改）</div>
-        <div
-          v-for="(item, index) in existingSections"
-          :key="'exist-' + (item.id || index)"
-          class="section-block section-block--readonly"
-        >
-          <Tag color="default">已拆分 {{ index + 1 }}</Tag>
-          <el-form label-width="100px" style="margin-top: 8px;">
-            <el-form-item label="标段名称">
+        <div class="existing-sections-title">已拆分标段</div>
+        <el-form ref="existingForm" :model="{ existingSections }" label-width="100px">
+          <div
+            v-for="(item, index) in existingSections"
+            :key="'exist-' + (item.id || index)"
+            class="section-block section-block--readonly"
+          >
+            <Tag color="primary">标段{{ displaySectionNo(item) }}</Tag>
+            <el-form-item
+              label="标段序号"
+              :prop="'existingSections.' + index + '.section_no'"
+              :rules="isEditingSectionNo ? sectionNoRules(null, item.id) : []"
+              style="margin-top: 8px;"
+            >
+              <el-input-number
+                v-if="isEditingSectionNo"
+                :min="1"
+                :precision="0"
+                :controls="false"
+                v-model="item.section_no"
+                style="width: 100%;"
+                @change="resortExistingSections"
+              ></el-input-number>
+              <span v-else>{{ displaySectionNo(item) }}</span>
+            </el-form-item>
+            <el-form-item label="项目名称">
               <span>{{ item.section_name }}</span>
             </el-form-item>
             <el-form-item label="标段金额">
@@ -27,11 +51,13 @@
                 <span class="plan-link-money">{{ formatMoney(link.use_money) }}</span>
               </div>
             </el-form-item>
-          </el-form>
-        </div>
+          </div>
+        </el-form>
       </div>
 
-      <div v-if="isContinueMode && existingSections.length" class="new-sections-title">新增标段</div>
+      <div v-if="form.sections.length" class="new-sections-title">
+        {{ isContinueMode && existingSections.length ? '新增标段' : '标段信息' }}
+      </div>
 
       <el-form :model="form" ref="dynamicValidateForm" label-width="100px">
         <div
@@ -40,15 +66,28 @@
           class="section-block"
         >
           <div style="display: flex;justify-content: space-between;margin-bottom: 8px;">
-            <Tag color="primary">标段 {{ existingSections.length + index + 1 }}</Tag>
+            <Tag color="primary">标段{{ item.section_no || '新' }}</Tag>
             <el-button size="mini" type="danger" @click.prevent="removeSection(index)">删除</el-button>
           </div>
           <el-form-item
-            label="标段名称"
+            label="标段序号"
+            :prop="'sections.' + index + '.section_no'"
+            :rules="sectionNoRules(index)"
+          >
+            <el-input-number
+              :min="1"
+              :precision="0"
+              :controls="false"
+              v-model="item.section_no"
+              style="width: 100%;"
+            ></el-input-number>
+          </el-form-item>
+          <el-form-item
+            label="项目名称"
             :prop="'sections.' + index + '.section_name'"
-            :rules="{ required: true, message: '标段名称不能为空', trigger: 'blur' }"
+            :rules="{ required: true, message: '项目名称不能为空', trigger: 'blur' }"
           >
-            <el-input v-model="item.section_name"></el-input>
+            <el-input v-model="item.section_name" placeholder="请输入项目名称"></el-input>
           </el-form-item>
           <el-form-item
             label="标段金额"
@@ -79,15 +118,21 @@
           </el-form-item>
         </div>
       </el-form>
+
+      <div class="modal-footer">
+        <Button @click="hide">取消</Button>
+        <Button type="primary" :loading="submitting" @click="submit">确定</Button>
+      </div>
     </Modal>
   </div>
 </template>
 
 <script>
-import { splitSections, detailContract, getSections } from "@/api/contract/contract";
+import { splitSections, detailContract, getSections, saveSection } from "@/api/contract/contract";
 
-function emptySection() {
+function emptySection(sectionNo) {
   return {
+    section_no: sectionNo,
     section_name: '',
     plan_price: undefined,
     plan_links: []
@@ -99,12 +144,14 @@ export default {
     return {
       id: "",
       isShow: false,
+      submitting: false,
       row: {},
       sourcePlans: [],
       existingSections: [],
       isContinueMode: false,
+      isEditingSectionNo: false,
       form: {
-        sections: [emptySection()]
+        sections: [emptySection(1)]
       }
     };
   },
@@ -123,6 +170,99 @@ export default {
     hide() {
       this.isShow = false;
     },
+    toggleEditSectionNo() {
+      this.isEditingSectionNo = !this.isEditingSectionNo;
+      if (this.isEditingSectionNo) {
+        this.existingSections = this.fillMissingSectionNos(this.existingSections);
+      } else if (this.$refs.existingForm) {
+        this.$refs.existingForm.clearValidate();
+      }
+    },
+    displaySectionNo(item) {
+      const no = Number(item.section_no);
+      return no > 0 ? no : '-';
+    },
+    fillMissingSectionNos(sections) {
+      const list = [...(sections || [])];
+      const used = new Set();
+      list.forEach(item => {
+        const no = Number(item.section_no);
+        if (no > 0) {
+          used.add(no);
+        }
+      });
+      list.forEach(item => {
+        const no = Number(item.section_no);
+        if (no > 0) {
+          item.section_no = no;
+          return;
+        }
+        let n = 1;
+        while (used.has(n)) {
+          n += 1;
+        }
+        item.section_no = n;
+        used.add(n);
+      });
+      return this.sortSections(list);
+    },
+    sortSections(list) {
+      return [...(list || [])].sort((a, b) => {
+        const na = Number(a.section_no) || 0;
+        const nb = Number(b.section_no) || 0;
+        if (na !== nb) return na - nb;
+        return (a.id || 0) - (b.id || 0);
+      });
+    },
+    resortExistingSections() {
+      this.existingSections = this.sortSections(this.existingSections);
+    },
+    collectUsedSectionNos(excludeExistingId = null, excludeNewIndex = null) {
+      const nos = [];
+      this.existingSections.forEach(item => {
+        if (excludeExistingId && item.id === excludeExistingId) return;
+        if (item.section_no != null && item.section_no !== '') {
+          nos.push(Number(item.section_no));
+        }
+      });
+      this.form.sections.forEach((item, index) => {
+        if (excludeNewIndex === index) return;
+        if (item.section_no != null && item.section_no !== '') {
+          nos.push(Number(item.section_no));
+        }
+      });
+      return nos;
+    },
+    suggestNextSectionNo() {
+      const used = new Set(this.collectUsedSectionNos());
+      let n = 1;
+      while (used.has(n)) {
+        n += 1;
+      }
+      return n;
+    },
+    sectionNoRules(newIndex, existingId = null) {
+      return [{
+        required: true,
+        message: '标段序号不能为空',
+        trigger: 'blur'
+      }, {
+        validator: (rule, value, callback) => {
+          const no = Number(value);
+          if (!no || no <= 0) {
+            callback(new Error('标段序号须为正整数'));
+            return;
+          }
+          const duplicated = this.collectUsedSectionNos(existingId, newIndex).includes(no);
+          if (duplicated) {
+            callback(new Error('标段序号不可重复'));
+            return;
+          }
+          callback();
+        },
+        trigger: 'blur'
+      }];
+    },
     formatMoney(value) {
       if (value == null || value === '') return '-';
       return Number(value).toFixed(2).replace(/(\d)(?=(\d{3})+\.)/g, '$1,');
@@ -132,16 +272,19 @@ export default {
       return this.formatPlanLabel(plan) || `计划#${link.plan_id}`;
     },
     addSection() {
-      const sec = emptySection();
+      const sec = emptySection(this.suggestNextSectionNo());
       this.initPlanLinks(sec);
       this.form.sections.push(sec);
     },
     removeSection(index) {
-      if (this.form.sections.length <= 1) {
+      if (this.form.sections.length <= 1 && !this.isContinueMode) {
         this.$message.warning('至少保留一个标段');
         return;
       }
       this.form.sections.splice(index, 1);
+      if (!this.form.sections.length && this.isContinueMode) {
+        this.form.sections = [];
+      }
     },
     syncPlanLinkMoney(item) {
       if (item.plan_links.length === 1 && item.plan_price != null) {
@@ -187,46 +330,112 @@ export default {
       this.row = await detailContract({ id: this.id });
       this.sourcePlans = this.buildSourcePlans(this.row);
       this.isContinueMode = !!(this.row.split_status || this.row.section_count > 0);
+      this.isEditingSectionNo = false;
       this.existingSections = [];
       if (this.isContinueMode) {
         const res = await getSections({ contract_id: this.id });
-        this.existingSections = (res.children || []).map(child => ({
+        this.existingSections = this.fillMissingSectionNos(this.sortSections((res.children || []).map(child => ({
           id: child.id,
-          section_name: child.section_name,
+          section_no: child.section_no != null && child.section_no !== '' ? Number(child.section_no) : null,
+          section_name: child.name || child.section_name,
           plan_price: child.plan_price,
-          plan_links: child.plan_link || child.planLink || []
+          plan_links: child.plan_link || child.planLink || [],
+          originSectionNo: child.section_no != null && child.section_no !== '' ? Number(child.section_no) : null
+        }))));
+      }
+      const nextNo = this.suggestNextSectionNo();
+      this.form.sections = this.isContinueMode ? [] : [emptySection(nextNo)];
+      if (this.form.sections.length) {
+        this.initPlanLinks(this.form.sections[0]);
+      }
+    },
+    validateNewSectionPlans(sections) {
+      for (const sec of sections) {
+        if (sec.plan_links && sec.plan_links.length) {
+          const sum = sec.plan_links.reduce((t, l) => t + Number(l.use_money || 0), 0);
+          if (Math.abs(sum - Number(sec.plan_price || 0)) > 0.009) {
+            this.$message.error(`标段「${sec.section_name}」占用预算金额须等于标段金额`);
+            return false;
+          }
+        }
+      }
+      return true;
+    },
+    validateAllForms() {
+      const tasks = [];
+      if (this.form.sections.length && this.$refs.dynamicValidateForm) {
+        tasks.push(new Promise(resolve => {
+          this.$refs.dynamicValidateForm.validate(valid => resolve(valid));
         }));
       }
-      this.form.sections = [emptySection()];
-      this.initPlanLinks(this.form.sections[0]);
+      if (
+        this.isEditingSectionNo &&
+        this.$refs.existingForm &&
+        this.existingSections.length
+      ) {
+        tasks.push(new Promise(resolve => {
+          this.$refs.existingForm.validate(valid => resolve(valid));
+        }));
+      }
+      if (!tasks.length) {
+        return Promise.resolve(true);
+      }
+      return Promise.all(tasks).then(results => results.every(Boolean));
     },
-    submit() {
-      this.$refs.dynamicValidateForm.validate(valid => {
-        if (!valid) return;
+    getSectionsToUpdate() {
+      if (!this.isEditingSectionNo) {
+        return [];
+      }
+      return this.existingSections.filter(item => {
+        const current = Number(item.section_no);
+        const origin = item.originSectionNo;
+        return origin == null || origin <= 0 || current !== origin;
+      });
+    },
+    async submit() {
+      this.submitting = true;
+      try {
+        const valid = await this.validateAllForms();
+        if (!valid) {
+          return;
+        }
 
-        for (const sec of this.form.sections) {
-          if (sec.plan_links && sec.plan_links.length) {
-            const sum = sec.plan_links.reduce((t, l) => t + Number(l.use_money || 0), 0);
-            if (Math.abs(sum - Number(sec.plan_price || 0)) > 0.009) {
-              this.$message.error(`标段「${sec.section_name}」占用预算金额须等于标段金额`);
-              return;
-            }
-          }
+        const newSections = [...this.form.sections];
+        const sectionsToUpdate = this.getSectionsToUpdate();
+
+        if (!newSections.length && !sectionsToUpdate.length) {
+          this.$message.warning('请至少新增一个标段，或点击「编辑标段」修改标段序号');
+          return;
+        }
+        if (newSections.length && !this.validateNewSectionPlans(newSections)) {
+          return;
         }
 
-        splitSections({
-          contract_id: this.id,
-          sections: this.form.sections.map(sec => ({
-            section_name: sec.section_name,
-            plan_price: sec.plan_price,
-            plan_links: (sec.plan_links || []).filter(l => l.plan_id && l.use_money != null)
-          }))
-        }).then(() => {
-          this.$message.success(this.isContinueMode ? '追加标段成功' : '拆分成功');
-          this.hide();
-          this.$emit('refresh');
-        });
-      });
+        for (const item of sectionsToUpdate) {
+          await saveSection({
+            id: item.id,
+            section_no: item.section_no
+          });
+        }
+        if (newSections.length) {
+          await splitSections({
+            contract_id: this.id,
+            sections: newSections.map(sec => ({
+              section_no: sec.section_no,
+              section_name: sec.section_name,
+              plan_price: sec.plan_price,
+              plan_links: (sec.plan_links || []).filter(l => l.plan_id && l.use_money != null)
+            }))
+          });
+        }
+        this.$message.success(this.isContinueMode ? '保存成功' : '拆分成功');
+        this.hide();
+        this.$emit('refresh');
+      } catch (error) {
+        this.$message.error(error?.message || '保存失败');
+      } finally {
+        this.submitting = false;
+      }
     },
   },
   watch: {
@@ -234,10 +443,12 @@ export default {
       if (newVal) {
         this.getDetail();
       } else {
-        this.form.sections = [emptySection()];
+        this.form.sections = [emptySection(1)];
         this.existingSections = [];
         this.sourcePlans = [];
         this.isContinueMode = false;
+        this.isEditingSectionNo = false;
+        this.submitting = false;
       }
     },
     id() {
@@ -250,6 +461,23 @@ export default {
 </script>
 
 <style scoped lang="scss">
+.modal-toolbar {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  margin-bottom: 10px;
+}
+.modal-toolbar-actions {
+  display: flex;
+  gap: 8px;
+}
+.modal-footer {
+  margin-top: 16px;
+  text-align: right;
+  button + button {
+    margin-left: 8px;
+  }
+}
 .existing-sections-title,
 .new-sections-title {
   font-weight: 600;
diff --git a/src/views/contract/contractList.vue b/src/views/contract/contractList.vue
index b85e338..433f2ae 100644
--- a/src/views/contract/contractList.vue
+++ b/src/views/contract/contractList.vue
@@ -2515,17 +2515,16 @@ export default {
         this.list.splice(sourceIndex + 1, removeCount)
       }
     },
-    formatSectionLabel(index) {
-      const n = Number(index) + 1
-      const cn = ['一', '二', '三', '四', '五', '六', '七', '八', '九', '十']
-      if (n >= 1 && n <= 10) {
-        return `标段${cn[n - 1]}`
+    formatSectionLabel(sectionNo) {
+      const n = Number(sectionNo)
+      if (n > 0) {
+        return `标段${n}`
       }
-      return `标段${n}`
+      return '标段'
     },
     renderProjectNameCell(row) {
       const displayName = row.is_split_child
-        ? (row.section_name || row.name)
+        ? (row.name || row.section_name)
         : row.name
       const expired = row.type === 1 && row.end_date &&
         (this.$moment().valueOf() - this.$moment(row.end_date).valueOf()) > 0
@@ -2547,7 +2546,7 @@ export default {
       }
 
       if (row.is_split_child) {
-        const sectionLabel = this.formatSectionLabel(row._splitSectionIndex ?? 0)
+        const sectionLabel = this.formatSectionLabel(row.section_no || row._displaySectionNo)
         return (
           <span style="display:inline-flex;align-items:center;padding-left:12px;">
             <Tag color="primary" size="small" style="margin-right:8px;">{sectionLabel}</Tag>
@@ -2569,18 +2568,39 @@ export default {
         })
       }).catch(() => {})
     },
+    sortSplitChildren(children) {
+      const sorted = [...(children || [])].sort((a, b) => {
+        const na = Number(a.section_no) || 0
+        const nb = Number(b.section_no) || 0
+        if (na !== nb) return na - nb
+        return (a.id || 0) - (b.id || 0)
+      })
+      const used = new Set()
+      return sorted.map(child => {
+        const no = Number(child.section_no)
+        if (no > 0) {
+          used.add(no)
+          return child
+        }
+        let n = 1
+        while (used.has(n)) {
+          n += 1
+        }
+        used.add(n)
+        return { ...child, _displaySectionNo: n }
+      })
+    },
     buildDisplayList(data) {
       const rows = []
       ;(data || []).forEach(source => {
-        const children = source.split_children || source.splitChildren || []
+        const children = this.sortSplitChildren(source.split_children || source.splitChildren || [])
         const hasChildren = children.length > 0
         rows.push({ ...source, _hasSplitChildren: hasChildren })
         if (hasChildren && this.isSplitGroupExpanded(source.id)) {
-          children.forEach((child, index) => {
+          children.forEach(child => {
             rows.push(this.enrichSplitChildRow({
               ...child,
-              _splitParentId: source.id,
-              _splitSectionIndex: index
+              _splitParentId: source.id
             }, source))
           })
         }
@@ -2592,12 +2612,11 @@ export default {
       if (this.splitChildrenRowsCache[sourceId]) {
         return this.splitChildrenRowsCache[sourceId]
       }
-      const children = source.split_children || source.splitChildren || []
-      const rows = children.map((child, index) => {
+      const children = this.sortSplitChildren(source.split_children || source.splitChildren || [])
+      const rows = children.map(child => {
         const row = this.enrichSplitChildRow({
           ...child,
-          _splitParentId: sourceId,
-          _splitSectionIndex: index
+          _splitParentId: sourceId
         }, source)
         this.handleContractFlow(row)
         return row
@@ -2609,7 +2628,7 @@ export default {
       this.splitChildrenRowsCache = {}
       const rows = []
       ;(data || []).forEach(source => {
-        const children = source.split_children || source.splitChildren || []
+        const children = this.sortSplitChildren(source.split_children || source.splitChildren || [])
         const hasChildren = children.length > 0
         const sourceRow = { ...source, _hasSplitChildren: hasChildren }
         this.handleContractFlow(sourceRow)