diff --git a/src/form/input.js b/src/form/input.js
index 05df8bd..e9bce9f 100644
--- a/src/form/input.js
+++ b/src/form/input.js
@@ -24,8 +24,8 @@ class Input extends Component {
     icon: '',
     size: 'l',
     placeholder: '',
-    maxlength: null,
-    minlength: null,
+    maxlength: { type: Number, default: null },
+    minlength: { type: Number, default: null },
     value: {
       type: String,
       default: '',
diff --git a/src/form/number.js b/src/form/number.js
index 602efee..7321389 100644
--- a/src/form/number.js
+++ b/src/form/number.js
@@ -10,8 +10,8 @@ class WcNumber extends Component {
   static props = {
     type: 'primary',
     size: 'l',
-    max: null,
-    min: null,
+    max: { type: Number, default: null },
+    min: { type: Number, default: null },
     step: 1,
     value: {
       type: Number,
diff --git a/src/form/textarea.js b/src/form/textarea.js
index 2a19ddf..d8bb10c 100644
--- a/src/form/textarea.js
+++ b/src/form/textarea.js
@@ -19,10 +19,10 @@ class TextArea extends Component {
     readOnly: false,
     disabled: false,
     autosize: false,
-    maxheight: null,
-    minheight: null,
-    maxlength: null,
-    minlength: null,
+    maxheight: { type: Number, default: null },
+    minheight: { type: Number, default: null },
+    maxlength: { type: Number, default: null },
+    minlength: { type: Number, default: null },
     showLimit: false,
     lazy: 0 // 并发拦截时间, 单位毫秒
   }
diff --git a/src/image/index.js b/src/image/index.js
index 068c38a..a335b0c 100644
--- a/src/image/index.js
+++ b/src/image/index.js
@@ -12,7 +12,7 @@ class Image extends Component {
     src: '',
     fit: 'fill',
     lazy: false,
-    referrerPolicy: null,
+    referrerPolicy: { type: String, default: null },
     alt: {
       type: String,
       default: null