diff --git a/src/modules/tpm/challengesnew/css/newquestion.css b/src/modules/tpm/challengesnew/css/newquestion.css
index ca1ebb05e..46bb22c30 100644
--- a/src/modules/tpm/challengesnew/css/newquestion.css
+++ b/src/modules/tpm/challengesnew/css/newquestion.css
@@ -15,7 +15,7 @@
     background: #FFFFFF;
     box-shadow: 0px 4px 8px 2px rgba(212, 212, 212, 0.5);
     border-radius: 4px;
-    top: 100px;
+    top: 60px;
     left: 100px;
     overflow-y: scroll;
     cursor: pointer;
diff --git a/src/modules/tpm/challengesnew/tpm-md-editor.js b/src/modules/tpm/challengesnew/tpm-md-editor.js
index c1feec481..eae4f23e4 100644
--- a/src/modules/tpm/challengesnew/tpm-md-editor.js
+++ b/src/modules/tpm/challengesnew/tpm-md-editor.js
@@ -79,7 +79,6 @@ export default ({ mdID, onChange, onCMBeforeChange, onCMBlur, error = false, cla
   const resizeBarEl = useRef();
   const [editorInstance, setEditorInstance] = useState();
   const [atWhoVisible, setAtWhoVisible] = useState(false);
-  // const [atWho, setAtWho] = useState(undefined);
   const containerId = `mdEditor_${mdID}`;
   const editorBodyId = `mdEditors_${mdID}`;
   const tipId = `e_tips_mdEditor_${mdID}`;
@@ -109,19 +108,17 @@ export default ({ mdID, onChange, onCMBeforeChange, onCMBlur, error = false, cla
 
   function selectAtWho(username){
     setAtWhoVisible(false);
-    const a = editorInstance.cm;
-    const b = editorInstance.cm.on;
-    console.log('cm.getValue()', editorInstance.cm)
-    console.log('onchange', editorInstance.cm.doc.getCursor());
-    editorInstance.setValue(initValue.toString()+username);
-    // editorInstance.cm.on('change',(cm)=>{
-    //   onchange(cm.getValue()+username);
-    // })
-    // setAtWho(username);
-    // console.log('editorInstance1',editorInstance);
-    // console.log('editorInstance2',editorInstance);
+    const cm = editorInstance.cm;
+    //获取鼠标所在行的行数和ch
+    const cursor = cm.doc.getCursor();
+    const line = cursor.line;//行
+    const ch = cursor.ch;//列
+    //替换最后的内容
+    cm.replaceRange(username+" ",{line,ch},{line,ch});
   }
 
+  console.log('window.event',window.event);
+  
   const atWhoList = (
     <div className="at_who_list">
       {users && users.map((item,key)=>{
@@ -236,31 +233,22 @@ export default ({ mdID, onChange, onCMBeforeChange, onCMBlur, error = false, cla
       if (!noStorage) {
         tid = md_elocalStorage(editorInstance, `MDEditor__${containerId}`, containerId)
       }
-      editorInstance.cm.on('change', (cm) => {
-        if(forMember){
+      //当光标或选中内容时触发绑定@事件
+      editorInstance.cm.on("cursorActivity", () => {
+        if (forMember) {
           document.onkeydown = (e) => {
-            console.log('onkeydown', e)
             if (e.key === "@") {
               // 输入@键后在对应的位置显示可选的项目成员
-              // const endOffset = window.getSelection();
               setAtWhoVisible(true);
-              // const addValue = atWho? cm.getValue()+atWho:cm.getValue();
-              // onChange(addValue);
-            }else{
+            } else {
               setAtWhoVisible(false);
             }
           };
         }
-        console.log('change---')
+      });
+      editorInstance.cm.on("change", (cm) => {
         onChange && onChange(cm.getValue());
-        // atWho && onChange(addValue+atWho) && setAtWho(undefined);
-        // if(atWho){
-        //   onChange(cm.getValue()+atWho);
-        //   setAtWho(undefined);
-        // }else{
-        //   onChange(cm.getValue());
-        // }
-      })
+      });
       if (onChange) {
       }
       ro = onLayout()