diff --git a/packages/components/src/sender/index.less b/packages/components/src/sender/index.less
index dae776d4d..e212fc44d 100644
--- a/packages/components/src/sender/index.less
+++ b/packages/components/src/sender/index.less
@@ -76,7 +76,7 @@
   .tiny-textarea__inner {
     font-size: var(--tr-sender-input-font-size);
     border: none;
-    min-height: var(--tr-sender-textarea-min-height); // 最小高度与单行保持一致
+    min-height: var(--tr-sender-textarea-min-height) !important; // 最小高度与单行保持一致
     padding: 0;
     background-color: var(--tr-sender-bg-color);
     color: var(--tr-sender-text-color);
diff --git a/packages/components/src/sender/vars.less b/packages/components/src/sender/vars.less
index 2aad012ee..fa2432364 100644
--- a/packages/components/src/sender/vars.less
+++ b/packages/components/src/sender/vars.less
@@ -231,6 +231,7 @@
   --tr-sender-input-font-size: var(--tr-sender-compact-font-size);
   --tr-sender-input-line-height: var(--tr-sender-compact-line-height);
   --tr-sender-input-height: var(--tr-sender-compact-input-height);
+  --tr-sender-textarea-min-height: var(--tr-sender-compact-line-height);
 
   // 覆盖圆角和图标尺寸
   --tr-sender-input-radius: var(--tr-sender-compact-input-radius);