diff --git a/src/components/olmap/HealthRiskAnalysis/Timeline.tsx b/src/components/olmap/HealthRiskAnalysis/Timeline.tsx
index 9e799c1..68cd669 100644
--- a/src/components/olmap/HealthRiskAnalysis/Timeline.tsx
+++ b/src/components/olmap/HealthRiskAnalysis/Timeline.tsx
@@ -435,16 +435,19 @@ const Timeline: React.FC<TimelineProps> = ({
           message: `模拟预测完成，获取到 ${results.length} 条管道数据`,
         });
       } else {
+        // 读取后端 HTTPException 返回的 detail 信息
+        const errorData = await response.json().catch(() => ({}));
+        const errorMessage = errorData.detail || "模拟预测失败";
         open?.({
           type: "error",
-          message: "模拟预测失败",
+          message: errorMessage,
         });
       }
-    } catch (error) {
+    } catch (error: any) {
       console.error("Simulation prediction failed:", error);
       open?.({
         type: "error",
-        message: "模拟预测时发生错误",
+        message: `模拟预测时发生错误: ${error.message || "未知错误"}`,
       });
     } finally {
       setIsPredicting(false);