diff --git a/packages/global/core/workflow/runtime/type.d.ts b/packages/global/core/workflow/runtime/type.d.ts
index a248c83d2..1402478f8 100644
--- a/packages/global/core/workflow/runtime/type.d.ts
+++ b/packages/global/core/workflow/runtime/type.d.ts
@@ -130,7 +130,7 @@ export type DispatchNodeResponseType = {
 
   // http
   params?: Record<string, any>;
-  body?: Record<string, any>;
+  body?: Record<string, any> | string;
   headers?: Record<string, any>;
   httpResult?: Record<string, any>;
 
diff --git a/packages/service/core/workflow/dispatch/tools/http468.ts b/packages/service/core/workflow/dispatch/tools/http468.ts
index 440c15d16..b0fafbd74 100644
--- a/packages/service/core/workflow/dispatch/tools/http468.ts
+++ b/packages/service/core/workflow/dispatch/tools/http468.ts
@@ -111,6 +111,9 @@ export const dispatchHttp468Request = async (props: HttpRequestProps): Promise<H
     if (!httpJsonBody) return {};
     try {
       httpJsonBody = replaceVariable(httpJsonBody, allVariables);
+      if (headers['Content-Type']?.includes('text/plain')) {
+        return httpJsonBody?.replaceAll(UNDEFINED_SIGN, 'null');
+      }
       const jsonParse = JSON.parse(httpJsonBody);
       const removeSignJson = removeUndefinedSign(jsonParse);
       return removeSignJson;
@@ -196,7 +199,7 @@ async function fetchData({
   method: string;
   url: string;
   headers: Record<string, any>;
-  body: Record<string, any>;
+  body: Record<string, any> | string;
   params: Record<string, any>;
 }) {
   const { data: response } = await axios({