diff --git a/bricks/css/bricks.css b/bricks/css/bricks.css
index 70e2c61..8b151a3 100755
--- a/bricks/css/bricks.css
+++ b/bricks/css/bricks.css
@@ -612,6 +612,12 @@ hr {
 }
 
 .auto-textarea {
+	/* 1. 确保计算模型一致 */
+	box-sizing: border-box;
+	/* 2. 允许元素内部处理滚动事件，不传递给父层 */
+	touch-action: pan-y;
+	/* 3. 极其重要：有些 H5 框架会禁用默认滚动，这里强制开启 */
+	pointer-events: auto !important;
 	width: 100%;
 	min-height: 40px;      /* 初始高度 */
 	max-height: 150px;     /* 最大高度：超过此高度将滚动 */
diff --git a/bricks/input.js b/bricks/input.js
index 688cfee..2f0c886 100644
--- a/bricks/input.js
+++ b/bricks/input.js
@@ -922,9 +922,9 @@ bricks.UiText =class extends bricks.UiType {
 		opts.dynsize = opts.dynsize || true;
 		opts.cfontsize = opts.cfontsize || 1;
 		if (opts.css){
-			opts.css += 'auto-textarea';
+			opts.css += ' inputbox auto-textarea';
 		} else {
-			opts.css = 'auto-textarea';
+			opts.css = 'inputbox auto-textarea';
 		}
 		super(opts);
 		this.uitype='text';
@@ -942,6 +942,8 @@ bricks.UiText =class extends bricks.UiType {
 		const scrollHeight = el.scrollHeight;
 		// 3. 获取 CSS 中定义的 max-height (150px)
 		const maxHeight = parseInt(window.getComputedStyle(el).maxHeight);
+		const paddingTop = parseInt(style.paddingTop);
+		const paddingBottom = parseInt(style.paddingBottom);
 
 		if (scrollHeight >= maxHeight) {
 			// 4. 如果内容高度超过最大高度，固定为最大高度并显示滚动条