diff --git a/SimpleAdmin.Application/Services/Onboarding/ContractSnapshot/OnboardingContractSnapshotService.cs b/SimpleAdmin.Application/Services/Onboarding/ContractSnapshot/OnboardingContractSnapshotService.cs
index ec54839..a4611f6 100644
--- a/SimpleAdmin.Application/Services/Onboarding/ContractSnapshot/OnboardingContractSnapshotService.cs
+++ b/SimpleAdmin.Application/Services/Onboarding/ContractSnapshot/OnboardingContractSnapshotService.cs
@@ -63,13 +63,29 @@ public class OnboardingContractSnapshotService : IOnboardingContractSnapshotServ
                 };
             }).ToList();
 
+            // 仅当参与合同渲染的变量编码或变量值发生变化时，才作废已生成文件。
+            // 重复保存完全相同的员工资料不应导致员工刚查看的合同突然失效。
+            var snapshotChanged = oldRows.Count != rows.Count
+                                  || rows.Any(row =>
+                                  {
+                                      var old = oldRows.FirstOrDefault(item =>
+                                          item.VariableCode == row.VariableCode);
+                                      return old == null
+                                             || !string.Equals(
+                                                 old.VariableValue,
+                                                 row.VariableValue,
+                                                 StringComparison.Ordinal);
+                                  });
+
             await _db.Deleteable<ObTaskContractVariable>()
                 .Where(item => item.TaskContractId == contract.Id)
                 .ExecuteCommandAsync();
             if (rows.Count > 0)
                 await _db.Insertable(rows).ExecuteCommandAsync();
 
-            if (invalidateGeneratedPreview && task.TaskStatus is OnboardingTaskStatus.PendingFill or OnboardingTaskStatus.Rejected)
+            if (invalidateGeneratedPreview
+                && snapshotChanged
+                && task.TaskStatus is OnboardingTaskStatus.PendingFill or OnboardingTaskStatus.Rejected)
             {
                 contract.GeneratedDocxFileId = null;
                 contract.GeneratedPdfFileId = null;
@@ -204,4 +220,4 @@ public class OnboardingContractSnapshotService : IOnboardingContractSnapshotServ
             _ => sourceField
         };
     }
-}
\ No newline at end of file
+}
diff --git a/SimpleAdmin.Application/Services/Onboarding/PublicTask/OnboardingPublicTaskService.cs b/SimpleAdmin.Application/Services/Onboarding/PublicTask/OnboardingPublicTaskService.cs
index 60b94ff..dc449e4 100644
--- a/SimpleAdmin.Application/Services/Onboarding/PublicTask/OnboardingPublicTaskService.cs
+++ b/SimpleAdmin.Application/Services/Onboarding/PublicTask/OnboardingPublicTaskService.cs
@@ -213,10 +213,16 @@ public class OnboardingPublicTaskService : IOnboardingPublicTaskService
         var contract = await _db.Queryable<ObTaskContract>()
             .FirstAsync(item => item.Id == input.TaskContractId && item.TaskId == link.TaskId)
             ?? throw Oops.Bah("合同不存在");
-        var fileId = contract.GeneratedDocxFileId
-            ?? throw Oops.Bah("合同尚未准备完成，请刷新页面后重试");
+        var fileId = contract.GeneratedDocxFileId;
+        if (!fileId.HasValue)
+        {
+            // 下载入口增加服务端兜底，避免前端状态与数据库短暂不同步时打开 JSON 错误页。
+            var prepared = await PrepareContract(input);
+            fileId = prepared.FileId;
+        }
+
         var fileExists = await _db.Queryable<SysFile>()
-            .AnyAsync(item => item.Id == fileId);
+            .AnyAsync(item => item.Id == fileId.Value);
         if (!fileExists)
             throw Oops.Bah("合同文件不存在，请重新准备合同");
 
@@ -227,7 +233,7 @@ public class OnboardingPublicTaskService : IOnboardingPublicTaskService
         await _db.Updateable(contract)
             .UpdateColumns(item => new { item.ReadAt, item.ContractStatus })
             .ExecuteCommandAsync();
-        return fileId;
+        return fileId.Value;
     }
 
     /// <summary>