diff --git a/package.json b/package.json
index 9b1add6..1952028 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "uxcore-select-form-field",
-  "version": "0.4.20",
+  "version": "0.4.21",
   "description": "uxcore-select-form-field component for uxcore.",
   "repository": "https://github.com/uxcore/uxcore-select-form-field.git",
   "author": "eternalsky",
diff --git a/src/SelectFormField.jsx b/src/SelectFormField.jsx
index a99e527..6940913 100644
--- a/src/SelectFormField.jsx
+++ b/src/SelectFormField.jsx
@@ -147,7 +147,7 @@ class SelectFormField extends FormField {
       jsxdata,
     } = this.props;
 
-    this.fetch = NattyFetch.create({
+    const param = {
       url: jsxfetchUrl,
       jsonp: dataType
         ? dataType === 'jsonp'
@@ -156,10 +156,13 @@ class SelectFormField extends FormField {
         q: value,
       }),
       method: fetchMethod || method,
-      header: fetchHeader,
       fit: fitResponse,
       Promise,
-    });
+    }
+    if (fetchHeader) {
+      param.header = fetchHeader
+    }
+    this.fetch = NattyFetch.create(param);
 
     this.fetch().then((content) => {
       let fetchData = processData(afterFetch(content));
@@ -492,8 +495,8 @@ SelectFormField.defaultProps = assign({}, FormField.defaultProps, {
   fetchDataOnMount: true,
   useValueText: false,
   method: 'GET',
-  fetchMethod: '', // 替代method
-  fetchHeader: {},
+  fetchMethod: undefined,
+  fetchHeader: undefined,
   dropdownAlign: {
     points: ['tl', 'bl', 'tr', 'br'],
     offset: [0, 4],