diff --git a/src/packages/textarea/textarea.taro.tsx b/src/packages/textarea/textarea.taro.tsx
index 4526774273..663fd214ab 100644
--- a/src/packages/textarea/textarea.taro.tsx
+++ b/src/packages/textarea/textarea.taro.tsx
@@ -57,7 +57,7 @@ export const TextArea: FunctionComponent<Partial<TextAreaProps>> = (props) => {
   const compositionRef = useRef(false)
 
   const format = (value: string) => {
-    if (maxLength !== undefined && value.length > maxLength) {
+    if (maxLength !== -1 && value.length > maxLength) {
       return value.substring(0, maxLength)
     }
     return value
diff --git a/src/packages/textarea/textarea.tsx b/src/packages/textarea/textarea.tsx
index 3a643f28b7..a640575e98 100644
--- a/src/packages/textarea/textarea.tsx
+++ b/src/packages/textarea/textarea.tsx
@@ -62,7 +62,7 @@ export const TextArea: FunctionComponent<
   const compositionRef = useRef(false)
 
   const format = (value: string) => {
-    if (maxLength !== undefined && value.length > maxLength) {
+    if (maxLength !== -1 && value.length > maxLength) {
       return value.substring(0, maxLength)
     }
     return value