diff --git a/web/src/components/TraderConfigModal.tsx b/web/src/components/TraderConfigModal.tsx
index 4676c194..4f9ddc72 100644
--- a/web/src/components/TraderConfigModal.tsx
+++ b/web/src/components/TraderConfigModal.tsx
@@ -96,7 +96,7 @@ export function TraderConfigModal({
       });
     }
     // 确保旧数据也有默认的 system_prompt_template
-    if (traderData && !traderData.system_prompt_template) {
+    if (traderData && traderData.system_prompt_template === undefined) {
       setFormData(prev => ({
         ...prev,
         system_prompt_template: 'default'