diff --git a/src/components/FileTree.vue b/src/components/FileTree.vue
index bbc9fad..b442025 100644
--- a/src/components/FileTree.vue
+++ b/src/components/FileTree.vue
@@ -359,7 +359,7 @@ const handleMenuClick = async ({ key }, node) => {
     case "newFile":
       modalTitle.value = "新建文件";
       modalInputValue.value = "";
-      modalPlaceholder.value = "请输入文件名 (包含后缀)";
+      modalPlaceholder.value = "请输入文件名 (默认.md后缀)";
       currentAction.value = "newFile";
       modalVisible.value = true;
       break;
@@ -398,6 +398,9 @@ const handleModalOk = async () => {
     message.warning("请输入内容");
     return;
   }
+  if (currentAction.value === "newFile" && !modalInputValue.value.endsWith(".md")) {
+    modalInputValue.value += ".md";
+  }
 
   const node = currentNode.value;
   // 如果是新建，父目录是 node.path；如果是重命名，父目录是 node 的父级