diff --git a/frontend/components/common/admin/task-executions.tsx b/frontend/components/common/admin/task-executions.tsx
index a3538c87..d9f78e55 100644
--- a/frontend/components/common/admin/task-executions.tsx
+++ b/frontend/components/common/admin/task-executions.tsx
@@ -341,7 +341,7 @@ export function TaskExecutionsManager() {
 
                 <div className="grid gap-2">
                   <Label>执行结果</Label>
-                  <div className="min-h-10 rounded-md border bg-muted/30 px-3 py-2 text-sm">
+                  <div className="min-h-10 rounded-md border bg-muted/30 px-3 py-2 text-sm whitespace-pre-wrap break-all">
                     {selectedExecution.result || "-"}
                   </div>
                 </div>
@@ -349,7 +349,7 @@ export function TaskExecutionsManager() {
                 {selectedExecution.error_message && (
                   <div className="grid gap-2">
                     <Label>错误信息</Label>
-                    <div className="rounded-md border border-destructive/30 bg-destructive/5 px-3 py-2 text-sm text-destructive">
+                    <div className="rounded-md border border-destructive/30 bg-destructive/5 px-3 py-2 text-sm text-destructive whitespace-pre-wrap break-all">
                       {selectedExecution.error_message}
                     </div>
                   </div>
diff --git a/internal/model/task_execution.go b/internal/model/task_execution.go
index c6d5fa05..e2ad48f8 100644
--- a/internal/model/task_execution.go
+++ b/internal/model/task_execution.go
@@ -58,9 +58,9 @@ func CreateTaskExecution(ctx context.Context, execution *TaskExecution) error {
 	return db.DB(ctx).Create(execution).Error
 }
 
-// UpdateTaskExecution 更新任务执行记录
+// UpdateTaskExecution 更新任务执行记录，忽略 log 字段以防覆写正在追加的日志
 func UpdateTaskExecution(ctx context.Context, execution *TaskExecution) error {
-	return db.DB(ctx).Save(execution).Error
+	return db.DB(ctx).Omit("log").Save(execution).Error
 }
 
 // GetTaskExecutionByTaskID 根据 TaskID 获取执行记录
diff --git a/internal/model/task_execution_test.go b/internal/model/task_execution_test.go
index a7a08e95..58943d12 100644
--- a/internal/model/task_execution_test.go
+++ b/internal/model/task_execution_test.go
@@ -188,6 +188,41 @@ func TestUpdateTaskExecutionFailed(t *testing.T) {
 	assert.Equal(t, int64(200), found.Duration)
 }
 
+func TestUpdateTaskExecutionDoesNotOverwriteLog(t *testing.T) {
+	cleanup := setupTaskExecutionTestEnvironment(t)
+	defer cleanup()
+	ctx := context.Background()
+
+	execution := &TaskExecution{
+		TaskID:      "test_omit_log_001",
+		TaskType:    "upload:cleanup_unused",
+		TaskName:    "清理未使用上传",
+		Status:      TaskExecutionStatusPending,
+		TriggeredBy: "manual",
+	}
+	err := CreateTaskExecution(ctx, execution)
+	require.NoError(t, err)
+
+	// In a real execution, logs are appended to the DB asynchronously via AppendTaskExecutionLog
+	err = AppendTaskExecutionLog(ctx, "test_omit_log_001", "第一条执行日志")
+	require.NoError(t, err)
+
+	// The local struct still has empty Log because it was not reloaded
+	assert.Empty(t, execution.Log)
+
+	// Now complete/update the execution (e.g. status, duration)
+	execution.Status = TaskExecutionStatusSucceeded
+	execution.Duration = 100
+	err = UpdateTaskExecution(ctx, execution)
+	require.NoError(t, err)
+
+	// Get the updated execution record and check that the Log was NOT overwritten/wiped
+	found, err := GetTaskExecutionByTaskID(ctx, "test_omit_log_001")
+	require.NoError(t, err)
+	assert.Equal(t, TaskExecutionStatusSucceeded, found.Status)
+	assert.Contains(t, found.Log, "第一条执行日志")
+}
+
 func TestAppendTaskExecutionLog(t *testing.T) {
 	cleanup := setupTaskExecutionTestEnvironment(t)
 	defer cleanup()