diff --git a/.gitignore b/.gitignore
index edfa44e..eecf1ec 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,4 +6,5 @@ docs/.vuepress/dist
 
 .idea
 .history
-.vs
\ No newline at end of file
+.vs
+.vscode
\ No newline at end of file
diff --git a/src/controllers/selection.js b/src/controllers/selection.js
index af835bc..b464f45 100644
--- a/src/controllers/selection.js
+++ b/src/controllers/selection.js
@@ -467,6 +467,8 @@ const selection = {
                     if(c_value == null){
                         c_value = "";
                     }
+                    
+                    c_value = formula.ltGtSignDeal(c_value)
 
                     column += c_value;
                 }
diff --git a/src/controllers/updateCell.js b/src/controllers/updateCell.js
index ad088dc..f9a947c 100644
--- a/src/controllers/updateCell.js
+++ b/src/controllers/updateCell.js
@@ -222,6 +222,7 @@ export function luckysheetupdateCell(row_index1, col_index1, d, cover, isnotfocu
         $("#luckysheet-rich-text-editor").html("");
     }
     else{
+        value = formula.ltGtSignDeal(value);
         $("#luckysheet-rich-text-editor").html(value);
         if (!isnotfocus) {
             luckysheetRangeLast($("#luckysheet-rich-text-editor")[0]);
diff --git a/src/global/formula.js b/src/global/formula.js
index cdb9d1d..8aa8901 100755
--- a/src/global/formula.js
+++ b/src/global/formula.js
@@ -325,6 +325,13 @@ const luckysheetformula = {
         if (typeof str !== 'string') return str;
         return str.replace(/<script>/g, '&lt;script&gt;').replace(/<\/script>/, '&lt;/script&gt;');
     },
+    ltGtSignDeal: function (str) {
+        if (typeof str !== 'string') return str;
+        if (str.substr(0, 5) === "<span" || str.startsWith('=')) {
+            return str
+        }
+        return str.replace(/</g, '&lt;').replace(/>/g, '&gt;');
+    },
     fucntionboxshow: function(r, c) {
 
         if (!checkProtectionCellHidden(r, c, Store.currentSheetIndex)) {
@@ -3407,10 +3414,12 @@ const luckysheetformula = {
 
                     }
                     else {
+                        value = _this.ltGtSignDeal(value);
                         $copy.html(value);
                     }
                 }
                 else {
+                    value = _this.ltGtSignDeal(value);
                     $copy.html(value);
                 }
             }