diff --git a/src/common/model/base/Base.ts b/src/common/model/base/Base.ts
index 3a89700..10045d6 100644
--- a/src/common/model/base/Base.ts
+++ b/src/common/model/base/Base.ts
@@ -121,6 +121,15 @@ export default class Base {
         bean = new Clazz()
       }
 
+
+      if (typeof obj === "string") {
+        try {
+          obj = JSON.parse(obj)
+        } catch (e) {
+          console.error("JSON parse obj error", e)
+        }
+      }
+
       if (obj !== null) {
         bean.assign(obj)
         thisObj[field] = bean
diff --git a/src/pages/preference/widget/PreviewConfigPanel.tsx b/src/pages/preference/widget/PreviewConfigPanel.tsx
index 6c52cec..acb0d1a 100644
--- a/src/pages/preference/widget/PreviewConfigPanel.tsx
+++ b/src/pages/preference/widget/PreviewConfigPanel.tsx
@@ -46,6 +46,8 @@ export default class PreviewConfigPanel extends TankComponent <IProps, IState> {
 
     let previewConfig: PreviewConfig = this.props.previewConfig
 
+    console.log("previewConfig", previewConfig)
+
     return (
 
       <div className="widget-preview-config-panel">
diff --git a/src/pages/preference/widget/PreviewEngineCell.tsx b/src/pages/preference/widget/PreviewEngineCell.tsx
index 12a9f63..a3c5558 100644
--- a/src/pages/preference/widget/PreviewEngineCell.tsx
+++ b/src/pages/preference/widget/PreviewEngineCell.tsx
@@ -3,8 +3,7 @@ import "./PreviewEngineCell.less"
 import TankComponent from "../../../common/component/TankComponent";
 import PreviewEngine from "../../../common/model/preference/model/PreviewEngine";
 import {DeleteOutlined} from '@ant-design/icons';
-import {Input, Form} from "antd";
-import InfoCell from "../../widget/InfoCell";
+import {Form, Input} from "antd";
 
 interface IProps {
 
@@ -47,22 +46,31 @@ export default class PreviewEngineCell extends TankComponent <IProps, IState> {
         </div>
         <div className="engine-content">
 
-          <Form.Item label="Warning" hasFeedback validateStatus="warning">
-            <Input.Password placeholder="with input password" />
+          <Form.Item
+            label={"URL"}
+            validateStatus={previewEngine.url ? undefined : 'error'}
+            help={previewEngine.url ? undefined : "url不能为空，{matterUrl}表示文件路径，预览时会自动替换成对应的文件url"}
+          >
+            <Input value={previewEngine.url}
+                   placeholder="请输入url，{matterUrl}表示注入的文件url路径"
+                   onChange={(e) => {
+                     previewEngine.url = e.target.value
+                     this.updateUI()
+                   }}/>
           </Form.Item>
 
-          <InfoCell name={"URL"} firstSpan={4}>
-            <Input value={previewEngine.url} onChange={(e) => {
-              previewEngine.url = e.target.value
-              this.updateUI()
-            }}/>
-          </InfoCell>
-          <InfoCell name={"后缀"} firstSpan={4}>
-            <Input value={previewEngine.extensions} onChange={(e) => {
-              previewEngine.extensions = e.target.value
-              this.updateUI()
-            }}/>
-          </InfoCell>
+          <Form.Item
+            label={"后缀"}
+            validateStatus={previewEngine.extensions ? undefined : 'error'}
+            help={previewEngine.extensions ? undefined : "后缀不能为空，使用逗号分隔，不用带. 例如：doc,ppt,xls"}
+          >
+            <Input value={previewEngine.extensions}
+                   placeholder="请输入后缀，使用逗号分隔，不用带. 例如：doc,ppt,xls"
+                   onChange={(e) => {
+                     previewEngine.extensions = e.target.value
+                     this.updateUI()
+                   }}/>
+          </Form.Item>
 
         </div>