diff --git a/ry-api/ruoyi-business/src/main/java/com/ruoyi/business/controller/BizProjectController.java b/ry-api/ruoyi-business/src/main/java/com/ruoyi/business/controller/BizProjectController.java
index ce2b705..2b49ea7 100644
--- a/ry-api/ruoyi-business/src/main/java/com/ruoyi/business/controller/BizProjectController.java
+++ b/ry-api/ruoyi-business/src/main/java/com/ruoyi/business/controller/BizProjectController.java
@@ -172,6 +172,7 @@ public class BizProjectController extends BaseController
     public AjaxResult saveAssigns(@PathVariable("projectId") Long projectId, @RequestBody List<BizProjectAssign> assigns)
     {
         if (assigns == null) assigns = new ArrayList<>();
+        bizProjectAssignService.validateSum(projectId, assigns);
         bizProjectAssignService.deleteByProjectId(projectId);
         for (BizProjectAssign a : assigns) {
             a.setProjectId(projectId);
diff --git a/ry-api/ruoyi-business/src/main/java/com/ruoyi/business/service/IBizProjectAssignService.java b/ry-api/ruoyi-business/src/main/java/com/ruoyi/business/service/IBizProjectAssignService.java
index 2b8eee0..f5186b7 100644
--- a/ry-api/ruoyi-business/src/main/java/com/ruoyi/business/service/IBizProjectAssignService.java
+++ b/ry-api/ruoyi-business/src/main/java/com/ruoyi/business/service/IBizProjectAssignService.java
@@ -15,4 +15,9 @@ public interface IBizProjectAssignService
     int updateByPrimaryKey(BizProjectAssign entity);
     int deleteByPrimaryKey(String assignId);
     int deleteByProjectId(Long projectId);
+    /**
+     * 校验多个执行方总金额不超过项目总金额 (服务端二次校验, 防前端绕过)
+     * 超额抛 ServiceException
+     */
+    void validateSum(Long projectId, List<BizProjectAssign> assigns);
 }
diff --git a/ry-api/ruoyi-business/src/main/java/com/ruoyi/business/service/impl/BizProjectAssignServiceImpl.java b/ry-api/ruoyi-business/src/main/java/com/ruoyi/business/service/impl/BizProjectAssignServiceImpl.java
index 68a62d1..e32c325 100644
--- a/ry-api/ruoyi-business/src/main/java/com/ruoyi/business/service/impl/BizProjectAssignServiceImpl.java
+++ b/ry-api/ruoyi-business/src/main/java/com/ruoyi/business/service/impl/BizProjectAssignServiceImpl.java
@@ -1,13 +1,16 @@
 package com.ruoyi.business.service.impl;
 
+import java.math.BigDecimal;
 import java.util.Date;
 import java.util.List;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 import com.ruoyi.business.domain.BizOrg;
+import com.ruoyi.business.domain.BizProject;
 import com.ruoyi.business.domain.BizProjectAssign;
 import com.ruoyi.business.mapper.BizOrgMapper;
 import com.ruoyi.business.mapper.BizProjectAssignMapper;
+import com.ruoyi.business.mapper.BizProjectMapper;
 import com.ruoyi.business.service.IBizProjectAssignService;
 import com.ruoyi.common.exception.ServiceException;
 import com.ruoyi.common.utils.SecurityUtils;
@@ -20,6 +23,8 @@ public class BizProjectAssignServiceImpl implements IBizProjectAssignService
     private BizProjectAssignMapper bizProjectAssignMapper;
     @Autowired
     private BizOrgMapper bizOrgMapper;
+    @Autowired
+    private BizProjectMapper bizProjectMapper;
 
     @Override
     public BizProjectAssign getById(String assignId) { return bizProjectAssignMapper.selectByPrimaryKey(assignId); }
@@ -84,4 +89,27 @@ public class BizProjectAssignServiceImpl implements IBizProjectAssignService
 
     @Override
     public int deleteByProjectId(Long projectId) { return bizProjectAssignMapper.deleteByProjectId(projectId); }
+
+    /**
+     * 校验多个执行方总金额不超过项目总金额 (服务端二次校验, 防前端绕过)
+     * 超额抛 ServiceException, 由 axios 拦截器统一弹 ElMessage.error
+     */
+    @Override
+    public void validateSum(Long projectId, List<BizProjectAssign> assigns) {
+        if (assigns == null || assigns.isEmpty()) return;
+        BigDecimal sum = BigDecimal.ZERO;
+        for (BizProjectAssign a : assigns) {
+            if (a.getAmount() != null) sum = sum.add(a.getAmount());
+        }
+        if (sum.signum() <= 0) return;
+        BizProject p = bizProjectMapper.selectByPrimaryKey(projectId);
+        if (p == null) throw new ServiceException("项目 " + projectId + " 不存在");
+        BigDecimal total = p.getTotalAmount();
+        if (total == null || total.signum() <= 0) return;
+        if (sum.compareTo(total) > 0) {
+            throw new ServiceException(
+                "多个执行方的总金额(" + sum.toPlainString() + ")超过项目总金额(" + total.toPlainString() + ")"
+            );
+        }
+    }
 }
\ No newline at end of file
diff --git a/ry-vue3/src/views/manager/ManagerProjectsAssign.vue b/ry-vue3/src/views/manager/ManagerProjectsAssign.vue
index c5998ca..0749d89 100644
--- a/ry-vue3/src/views/manager/ManagerProjectsAssign.vue
+++ b/ry-vue3/src/views/manager/ManagerProjectsAssign.vue
@@ -6,7 +6,7 @@
     </div>
 
     <!-- 已选项目 (单条: 显示编号+名称 / 批量: 显示项目数) -->
-    <div v-if="batchMode" class="info-bar">
+    <div v-if="batchMode" v-loading="batchLoading" class="info-bar">
       已选 <b>{{ assignBatchProjects.length }}</b> 个项目 (本次分配将按各项目自身的总场次 / 总金额逐项校验)
     </div>
     <div v-else class="info-bar">
@@ -14,7 +14,7 @@
     </div>
 
     <!-- 项目核心属性 (单条模式: 只读展示, 字段未加载完时显示 -) -->
-    <el-descriptions v-if="!batchMode" class="project-meta" :column="3" border size="small">
+    <el-descriptions v-if="!batchMode" v-loading="singleLoading" class="project-meta" :column="3" border size="small">
       <el-descriptions-item label="项目编号">{{ currentProject?.projectNo || '-' }}</el-descriptions-item>
       <el-descriptions-item label="项目名称">{{ currentProject?.projectName || '-' }}</el-descriptions-item>
       <el-descriptions-item label="项目形式">{{ currentProject?.projectForm || '-' }}</el-descriptions-item>
@@ -24,7 +24,7 @@
     </el-descriptions>
 
     <el-form :model="assignForm" label-width="120px">
-      <el-form-item label="支持方">
+      <el-form-item label="支持单位">
         <el-select v-model="assignForm.sponsorAdminUserId" placeholder="请选择支持单位" filterable
           :filter-method="searchSponsorOrgs" clearable style="width:100%" @change="onSponsorOrgPick">
           <el-option v-for="u in sponsorOrgOptions" :key="u.userId"
@@ -32,7 +32,7 @@
         </el-select>
       </el-form-item>
 
-      <el-divider>执行方分配</el-divider>
+      <el-divider>执行单位分配</el-divider>
 
       <!-- 单选模式: 实时校验栏 -->
       <div v-if="!batchMode" class="assign-sessions-bar">
@@ -43,6 +43,9 @@
         <span>总金额(元): <b>{{ assignForm.totalAmount || 0 }}</b></span>
         <span :class="{ 'is-over': singleAmountOver }">已分配金额: <b>¥ {{ assignedAmount }}</b></span>
         <span v-if="singleAmountOver" class="over-warn">⚠ 已超出 ¥ {{ Math.round((assignedAmount - assignForm.totalAmount) * 100) / 100 }}</span>
+        <span class="sep">|</span>
+        <span>可用金额: <b>¥ {{ availableAmount }}</b></span>
+        <span class="hint">(公式: 总金额×(1-管理费/总金额)-累计劳务-累计会务)</span>
       </div>
       <!-- 批量模式: 提示保存时按各项目自身校验 -->
       <div v-else class="assign-sessions-bar">
@@ -52,7 +55,7 @@
 
       <el-table :data="assignForm.execRows" border>
         <el-table-column type="index" label="#" width="50" />
-        <el-table-column label="执行方名称" min-width="220">
+        <el-table-column label="执行单位" min-width="220">
           <template #default="{ row }">
             <el-select v-model="row.execUserId" filterable
               :filter-method="q => searchExecutors(q, row)"
@@ -77,7 +80,7 @@
         </el-table-column>
         <el-table-column label="操作" width="80">
           <template #default="{ $index }">
-            <el-button link type="danger" @click="assignForm.execRows.splice($index, 1)">删除</el-button>
+            <el-button link type="danger" :disabled="$index === 0 && assignForm.execRows.length === 1" @click="assignForm.execRows.splice($index, 1)">删除</el-button>
           </template>
         </el-table-column>
       </el-table>
@@ -86,10 +89,33 @@
       </div>
 
       <el-form-item label="提交截止(天)" style="margin-top:12px">
-        <el-input-number v-model="assignForm.deadlineDays" :min="0" controls-position="right" />
+        <el-input-number v-model="assignForm.deadlineDays" :min="1" :max="100" controls-position="right" />
+        <span class="hint-text" style="margin-left:12px">自然日, 1~100 天 (超出报错)</span>
       </el-form-item>
     </el-form>
 
+    <!-- 第 5 区块: 合同文件 (单条模式显示, 批量隐藏) -->
+    <div v-if="!batchMode && currentProject" class="contract-section">
+      <div class="new-card-title">合同文件</div>
+      <div class="notice-row">
+        <span class="notice-label">支持合同:</span>
+        <template v-if="currentProject.supportContractUrl">
+          <a class="file-link" @click.prevent="openPreview(currentProject.supportContractUrl, '支持合同')">合同文件</a>
+        </template>
+        <span v-else class="empty-tip">暂无</span>
+      </div>
+      <div class="notice-row">
+        <span class="notice-label">执行合同:</span>
+        <template v-if="currentProject.executeContractUrl">
+          <a class="file-link" @click.prevent="openPreview(currentProject.executeContractUrl, '执行合同')">合同文件</a>
+        </template>
+        <span v-else class="empty-tip">暂无</span>
+      </div>
+      <p class="hint-text">*根据项目编号,同步OA的合同文件, 可预览</p>
+    </div>
+
+    <Preview v-model="previewOpen" :url="previewUrl" :title="previewTitle" />
+
     <!-- 底部按钮 -->
     <div class="form-actions">
       <el-button @click="confirmCancel">取消</el-button>
@@ -105,6 +131,7 @@ import { bizUpdate, bizGet } from '@/api/public'
 import { listSponsorOrgs, listExecutorOrgs } from '@/api/system'
 import request from '@/utils/request'
 import { ElMessage, ElMessageBox } from 'element-plus'
+import Preview from '@/components/Preview.vue'
 
 const router = useRouter()
 const route = useRoute()
@@ -127,6 +154,20 @@ const assignForm = reactive({
 })
 const assignSubmitting = ref(false)
 
+// 合同预览 (支持合同 / 执行合同) — 单条模式用
+const previewOpen = ref(false)
+const previewUrl = ref('')
+const previewTitle = ref('')
+function openPreview(url, title) {
+  previewUrl.value = url
+  previewTitle.value = title || '附件预览'
+  previewOpen.value = true
+}
+
+// 加载状态
+const singleLoading = ref(false)
+const batchLoading = ref(false)
+
 const sponsorOrgOptions = ref([])
 let _supporterTimer = null
 
@@ -145,6 +186,17 @@ const assignedAmount = computed(() => {
 const singleAmountOver = computed(() =>
   !batchMode && Number(assignForm.totalAmount || 0) > 0 && assignedAmount.value > Number(assignForm.totalAmount)
 )
+// 可用金额 (公式: 总金额 × (1 - 管理费/总金额) - 累计劳务 - 累计会务)
+const availableAmount = computed(() => {
+  if (batchMode) return 0
+  const total = Number(assignForm.totalAmount || 0)
+  if (total <= 0) return 0
+  const manageFee = Number(currentProject.value?.manageFee || 0)
+  const paidLabor = Number(currentProject.value?.paidLaborAmount || 0)
+  const paidMeeting = Number(currentProject.value?.paidMeetingAmount || 0)
+  const avail = total * (1 - manageFee / total) - paidLabor - paidMeeting
+  return Math.round(avail * 100) / 100
+})
 
 function makeEmptyExecRow() {
   return { _loading: false, _timer: null, _options: [], execUserId: null, sessions: 0, amount: 0, remark: '' }
@@ -256,6 +308,7 @@ function onExecUserPick(row, userId) {
 // ========== 初始化 ==========
 async function loadSingleProject() {
   if (!singleProjectId) return
+  singleLoading.value = true
   try {
     const res = await bizGet('project', singleProjectId)
     const p = res?.data?.data || res?.data || res
@@ -271,13 +324,17 @@ async function loadSingleProject() {
     loadSponsorOrgs('')
   } catch (e) {
     ElMessage.error('加载项目数据失败: ' + (e?.msg || e?.message || e))
+  } finally {
+    singleLoading.value = false
   }
 }
 
 async function loadBatchProjects() {
-  if (!batchProjectIds.length) return
+  batchLoading.value = true
+  if (!batchProjectIds.length) { batchLoading.value = false; return }
   try {
     const list = []
+    const failed = []
     for (const pid of batchProjectIds) {
       try {
         const res = await bizGet('project', pid)
@@ -287,13 +344,26 @@ async function loadBatchProjects() {
             projectId: p.projectId,
             projectNo: p.projectNo,
             projectName: p.projectName,
+            sponsorAdminUserId: p.sponsorAdminUserId,
+            sponsorAdminUserName: p.sponsorAdminUserName,
             totalSessions: Number(p.totalSessions || 0),
             totalAmount: Number(p.totalAmount || 0)
           })
+        } else {
+          failed.push({ projectId: pid, reason: '返回数据为空' })
         }
-      } catch (e) { /* skip failed project */ }
+      } catch (e) {
+        failed.push({ projectId: pid, reason: e?.msg || e?.message || String(e) })
+      }
     }
     assignBatchProjects.value = list
+    if (failed.length) {
+      ElMessageBox.alert(
+        `以下项目加载失败已跳过:\n${failed.map(f => `项目 ${f.projectId}: ${f.reason}`).join('\n')}`,
+        '加载提示',
+        { type: 'warning' }
+      ).catch(() => {})
+    }
     // 批量模式: 取第一个项目的支持方作为默认 (用户可改)
     if (list.length) {
       assignForm.sponsorAdminUserId = list[0].sponsorAdminUserId || null
@@ -304,7 +374,9 @@ async function loadBatchProjects() {
     assignForm.execRows = [makeEmptyExecRow()]
     assignForm.execRows.forEach(r => searchExecutors('', r))
   } catch (e) {
-    ElMessage.error('加载批量项目失败')
+    ElMessage.error('加载批量项目失败: ' + (e?.msg || e?.message || e))
+  } finally {
+    batchLoading.value = false
   }
 }
 
@@ -438,4 +510,30 @@ async function submitAssign() {
 .assign-sessions-bar .sep { color: #dcdfe6; margin: 0 4px; }
 
 .form-actions { display: flex; justify-content: center; gap: 16px; padding: 20px 0 4px; border-top: 1px solid #f0f0f0; margin-top: 16px; }
+
+/* 章节标题 (复用 ProjectsNew 风格) */
+.new-card-title {
+  font-size: 14px;
+  font-weight: 600;
+  color: #262626;
+  margin: 16px 0 12px;
+  padding-left: 8px;
+  border-left: 3px solid var(--brand-primary);
+  line-height: 1;
+}
+
+/* 合同行 (复用 ProjectsNew 风格) */
+.contract-section { margin-top: 8px; }
+.notice-row { display: flex; align-items: stretch; gap: 12px; margin-bottom: 12px; }
+.notice-label {
+  width: 90px;
+  display: flex; align-items: center; justify-content: flex-end;
+  color: #606266; font-size: 14px;
+}
+.contract-section .file-link { color: #1890ff; cursor: pointer; font-size: 13px; display: flex; align-items: center; }
+.contract-section .file-link:hover { text-decoration: underline; }
+.contract-section .empty-tip { font-size: 13px; color: #c0c4cc; display: flex; align-items: center; }
+.hint-text { font-size: 12px; color: #909399; margin: 8px 0; line-height: 1.6; }
+.hint-text p { margin-bottom: 4px; }
+.hint-text p:last-child { margin-bottom: 0; }
 </style>
\ No newline at end of file