diff --git a/packages/taro-components-rn/src/components/Input/PropsType.tsx b/packages/taro-components-rn/src/components/Input/PropsType.tsx
index 1752f3915f82..b9bae094bdb7 100644
--- a/packages/taro-components-rn/src/components/Input/PropsType.tsx
+++ b/packages/taro-components-rn/src/components/Input/PropsType.tsx
@@ -25,7 +25,7 @@ export interface InputProps {
   password?: boolean;
   placeholder?: string;
   disabled?: boolean;
-  maxLength: number;
+  maxlength?: number;
   autoFocus?: boolean;
   confirmType: 'done' | 'send' | 'search' | 'next' | 'go';
   confirmHold?: boolean;
diff --git a/packages/taro-components-rn/src/components/Input/index.tsx b/packages/taro-components-rn/src/components/Input/index.tsx
index 1a20ef28f494..0d023db39c05 100644
--- a/packages/taro-components-rn/src/components/Input/index.tsx
+++ b/packages/taro-components-rn/src/components/Input/index.tsx
@@ -6,7 +6,7 @@
  * ✘ placeholder-style: Only placeholderTextColor(RN).
  * - placeholder-class
  * ✔ disabled
- * ✔ maxLength
+ * ✔ maxlength
  * ✘ cursor-spacing
  * - auto-focus
  * ✔ focus
@@ -58,7 +58,7 @@ const keyboardTypeMap: { [key: string]: string } = {
 class _Input extends React.Component<InputProps, InputState> {
   static defaultProps = {
     type: 'text',
-    maxLength: 140,
+    maxlength: 140,
     confirmType: 'done',
     selectionStart: -1,
     selectionEnd: -1
@@ -182,7 +182,7 @@ class _Input extends React.Component<InputProps, InputState> {
       password,
       placeholder,
       disabled,
-      maxLength,
+      maxlength,
       confirmType,
       confirmHold,
       cursor,
@@ -214,7 +214,7 @@ class _Input extends React.Component<InputProps, InputState> {
           'password',
           'placeholder',
           'disabled',
-          'maxLength',
+          'maxlength',
           'focus',
           'confirmType',
           'confirmHold',
@@ -235,7 +235,7 @@ class _Input extends React.Component<InputProps, InputState> {
         secureTextEntry={!!password}
         placeholder={placeholder}
         editable={!disabled}
-        maxLength={maxLength === -1 ? undefined : maxLength}
+        maxLength={maxlength === -1 ? undefined : maxlength}
         // returnKeyLabel={confirmType}
         returnKeyType={confirmType}
         blurOnSubmit={!_multiline && !confirmHold}
diff --git a/packages/taro-components-rn/src/components/Textarea/PropsType.tsx b/packages/taro-components-rn/src/components/Textarea/PropsType.tsx
index 127adec272d2..541d5996406f 100644
--- a/packages/taro-components-rn/src/components/Textarea/PropsType.tsx
+++ b/packages/taro-components-rn/src/components/Textarea/PropsType.tsx
@@ -3,6 +3,5 @@ import { InputProps, EventOnLineChange } from '../Input/PropsType'
 export interface TextareaProps extends InputProps {
   autoHeight?: boolean;
   autoFocus?: boolean;
-  maxlength?: number;
   onLineChange?: (evt: EventOnLineChange) => void;
 }
diff --git a/packages/taro-components-rn/src/components/Textarea/index.tsx b/packages/taro-components-rn/src/components/Textarea/index.tsx
index 9a3f66755297..e69f74c86c38 100644
--- a/packages/taro-components-rn/src/components/Textarea/index.tsx
+++ b/packages/taro-components-rn/src/components/Textarea/index.tsx
@@ -35,7 +35,7 @@ const _Textarea: React.FC<TextareaProps> = (props: TextareaProps) => {
         'onLineChange',
         'maxlength'
       ])}
-      maxLength={maxlength}
+      maxlength={maxlength}
     />
   )
 }