diff --git a/web/src/pages/NewAssessment.tsx b/web/src/pages/NewAssessment.tsx
index 3a86acb..d2cff7c 100644
--- a/web/src/pages/NewAssessment.tsx
+++ b/web/src/pages/NewAssessment.tsx
@@ -28,6 +28,8 @@ import {
   getDraft,
   saveDraft,
   deleteDraftApi,
+  fetchAssessmentDetail,
+  ApiError,
   type DraftRecord,
   type ClassificationResult,
   type IndicatorQuestion,
@@ -693,24 +695,47 @@ export function NewAssessment(): JSX.Element {
       const fullDescription =
         `【项目】${projectName || '未命名'}｜【客户】${customerName || '未提供'}\n${description}`;
 
-      const result = await runAssessment({
+      const knownDataArr = Object.entries(answers)
+        .filter((e): e is [string, number] => typeof e[1] === 'number')
+        .map(([k, v]): [string, number] => [k, v]);
+      const runWith = (expected: string | null) => runAssessment({
         projectDescription: fullDescription,
         confirmation: { businessType, ...(industry !== '' ? { industry } : {}) },
         region,
         ...(effectiveEditId !== null ? { assessmentId: effectiveEditId, useLlm: false } : {}),
-        ...(effectiveEditId !== null && editSavedAt !== null ? { expectedSavedAt: editSavedAt } : {}),
+        ...(effectiveEditId !== null && expected !== null ? { expectedSavedAt: expected } : {}),
         ...(Number(clientTotalHeadcount) > 0 ? { clientTotalHeadcount: Number(clientTotalHeadcount) } : {}),
         ...(user?.id !== undefined ? { assessorId: user.id } : {}),
-        knownData: Object.entries(answers)
-          .filter((e): e is [string, number] => typeof e[1] === 'number')
-          .map(([k, v]) => [k, v]),
+        knownData: knownDataArr,
         ...(baselineQuote > 0 ? { costInputs: { baselineQuote } } : {}),
         profitabilityInputs,
       });
+
+      let result;
+      try {
+        result = await runWith(editSavedAt);
+      } catch (e) {
+        // 乐观锁冲突：自动拉取最新版本号后重试一次（单人编辑场景下不应被卡住）。
+        if (e instanceof ApiError && e.status === 409 && effectiveEditId !== null) {
+          const latest = await fetchAssessmentDetail(effectiveEditId).catch(() => null);
+          const freshSavedAt = latest?.savedAt ?? null;
+          if (freshSavedAt !== null && freshSavedAt !== editSavedAt) {
+            setEditSavedAt(freshSavedAt);
+            result = await runWith(freshSavedAt);
+          } else {
+            throw e;
+          }
+        } else {
+          throw e;
+        }
+      }
       try { await deleteDraftApi(draftId); } catch { /* ignore */ }
       navigate(`/assessments/${result.assessmentId}`);
     } catch (err) {
-      setError(err instanceof Error ? err.message : '评估运行失败');
+      const msg = err instanceof ApiError && err.status === 409
+        ? '该评估已被他人同时修改，请返回详情页刷新后重试。'
+        : err instanceof Error ? err.message : '评估运行失败';
+      setError(msg);
       setRunning(false);
     }
   }