diff --git a/src/controllers/sheetmanage.js b/src/controllers/sheetmanage.js
index 995a77ab6..8b6f1375a 100644
--- a/src/controllers/sheetmanage.js
+++ b/src/controllers/sheetmanage.js
@@ -442,7 +442,7 @@ const sheetmanage = {
             return true;
         }
     },
-    createSheetbydata: function(data, isrenew) {
+    createSheetbydata: function(data, isrenew, isBefore=true) {
         let _this = this;
 
         let colorset = '';
@@ -452,13 +452,15 @@ const sheetmanage = {
 
         $("#luckysheet-sheet-container-c").append(replaceHtml(sheetHTML, { "index": data.index, "active": "", "name": data.name, "order": data.order, "style": "", "colorset": colorset }));
 
-        let previndex = data.order;
-        if(previndex >= Store.luckysheetfile.length){
-            previndex = Store.luckysheetfile.length - 1;
-            $("#luckysheet-sheets-item" + data.index).insertAfter($("#luckysheet-sheets-item" + Store.luckysheetfile[previndex].index));
-        }
-        else{
-            $("#luckysheet-sheets-item" + data.index).insertBefore($("#luckysheet-sheets-item" + Store.luckysheetfile[previndex].index));
+        if(isBefore){
+            let previndex = data.order;
+            if(previndex >= Store.luckysheetfile.length){
+                previndex = Store.luckysheetfile.length - 1;
+                $("#luckysheet-sheets-item" + data.index).insertAfter($("#luckysheet-sheets-item" + Store.luckysheetfile[previndex].index));
+            }
+            else{
+                $("#luckysheet-sheets-item" + data.index).insertBefore($("#luckysheet-sheets-item" + Store.luckysheetfile[previndex].index));
+            }
         }
         
         Store.luckysheetfile.push(data);
@@ -1011,6 +1013,29 @@ const sheetmanage = {
 
                 file["data"] = data;
                 file["load"] = "1";
+
+                let sheetindexset = _this.checkLoadSheetIndex(file);
+                let sheetindex = [];
+        
+                for(let i = 0; i < sheetindexset.length; i++){
+                    let item = sheetindexset[i];
+        
+                    if(item == file["index"]){
+                        continue;
+                    }
+        
+                    sheetindex.push(item);
+                }
+
+                for(let i = 0;i<sheetindex.length;i++){
+                    let item = sheetindex[i];
+                    let otherfile = Store.luckysheetfile[_this.getSheetIndex(item)]; 
+                    if(otherfile["load"] == null || otherfile["load"] == "0"){
+                        otherfile["data"] = _this.buildGridData(otherfile);
+                        otherfile["load"] = "1";
+                    }
+                }
+
                 _this.mergeCalculation(index);
                 _this.setSheetParam();
                 _this.showSheet();
diff --git a/src/core.js b/src/core.js
index a7730c1f6..86371b01f 100644
--- a/src/core.js
+++ b/src/core.js
@@ -180,6 +180,8 @@ luckysheet.setcellvalue = setcellvalue;
 // Get selection range value
 luckysheet.getdatabyselection = getdatabyselection;
 
+luckysheet.sheetmanage = sheetmanage;
+
 // Data of the current table
 luckysheet.flowdata = function () {
     return Store.flowdata;
diff --git a/src/global/draw.js b/src/global/draw.js
index e2b180f51..4dd825696 100644
--- a/src/global/draw.js
+++ b/src/global/draw.js
@@ -7,7 +7,7 @@ import { luckysheetdefaultstyle, luckysheet_CFiconsImg,luckysheetdefaultFont } f
 import { luckysheet_searcharray } from '../controllers/sheetSearch';
 import { dynamicArrayCompute } from './dynamicArray';
 import browser from './browser';
-import { isRealNull } from './validate';
+import { isRealNull, isRealNum } from './validate';
 import { getCellTextSplitArr,getMeasureText } from './getRowlen';
 import { getcellvalue } from './getdata';
 import { getBorderInfoCompute } from './border';
@@ -1239,7 +1239,7 @@ let cellRender = function(r, c, start_r, start_c, end_r, end_c, value, luckyshee
 
     //若单元格有批注（单元格右上角红色小三角标示）
     if(cell.ps != null){
-        let ps_w = 8*Store.zoomRatio, ps_h = 8*Store.zoomRatio; //红色小三角宽高
+        let ps_w = 6*Store.zoomRatio, ps_h = 6*Store.zoomRatio; //红色小三角宽高
 
         luckysheetTableContent.beginPath();
         luckysheetTableContent.moveTo(
@@ -1259,6 +1259,28 @@ let cellRender = function(r, c, start_r, start_c, end_r, end_c, value, luckyshee
         luckysheetTableContent.closePath();
     }
 
+    //若单元格强制为字符串，则显示绿色小三角
+    if(cell.qp==1 && isRealNum(cell.v)){
+        let ps_w = 6*Store.zoomRatio, ps_h = 6*Store.zoomRatio; //红色小三角宽高
+
+        luckysheetTableContent.beginPath();
+        luckysheetTableContent.moveTo(
+             (start_c + offsetLeft + ps_w), 
+            (start_r + offsetTop)
+        );
+        luckysheetTableContent.lineTo(
+             (start_c + offsetLeft), 
+            (start_r + offsetTop)
+        );
+        luckysheetTableContent.lineTo(
+             (start_c + offsetLeft), 
+             (start_r + offsetTop + ps_h)
+        );
+        luckysheetTableContent.fillStyle = "#487f1e";
+        luckysheetTableContent.fill();
+        luckysheetTableContent.closePath();
+    }
+
     //溢出单元格
     let cellOverflow_bd_r_render = true; //溢出单元格右边框是否需要绘制
     let cellOverflow_colInObj = cellOverflow_colIn(cellOverflowMap, r, c, dataset_col_st, dataset_col_ed);
diff --git a/src/global/formula.js b/src/global/formula.js
index a9a92df02..40c5e8d70 100644
--- a/src/global/formula.js
+++ b/src/global/formula.js
@@ -309,10 +309,8 @@ const luckysheetformula = {
     oldvalue: null,
     dontupdate: function() {
         let _this = this;
-
         Store.luckysheetCellUpdate.length = 0; //clear array
         $("#luckysheet-functionbox-cell, #luckysheet-rich-text-editor").html(_this.oldvalue);
-
         _this.cancelNormalSelected();
         if (_this.rangetosheet != Store.currentSheetIndex) {
             sheetmanage.changeSheetExec(_this.rangetosheet);
@@ -1209,7 +1207,7 @@ const luckysheetformula = {
                 return;
             }
         }
-        else{
+        else if(curv!=null && curv.qp != 1){
             if (getObjType(curv) == "object" && (value == curv.f || value == curv.v || value == curv.m)) {
                 _this.cancelNormalSelected();
                 return;
@@ -1267,6 +1265,14 @@ const luckysheetformula = {
 
                 delete curv.f;
                 delete curv.spl;
+
+                if(curv.qp == 1 && value.substr(0,1)!="'"){//if quotePrefix is 1, cell is force string, cell clear quotePrefix when it is updated 
+                    curv.qp = 0;
+                    if(curv.ct!=null){
+                        curv.ct.fa = "General";
+                        curv.ct.t = "n";
+                    }
+                }
             }
 
             value = curv;
@@ -3614,7 +3620,10 @@ const luckysheetformula = {
             _this.operatorjson = op;
         }
 
-        if (txt.substr(0, 1) == "=") {
+        if (txt.substr(0, 2) == "=+") {
+            txt = txt.substr(2);
+        }
+        else if (txt.substr(0, 1) == "=") {
             txt = txt.substr(1);
         }
 
@@ -4483,8 +4492,11 @@ const luckysheetformula = {
 
             for (let i = 0; i < group.length; i++) {
                 let item = group[i];
-
-                let cell = luckysheetfile[getSheetIndex(item["index"])].data[item.r][item.c];
+                let file =luckysheetfile[getSheetIndex(item["index"])];
+                if(file==null){
+                    continue;
+                }
+                let cell = file.data[item.r][item.c];
                 let calc_funcStr = getcellFormula(item.r, item.c, item.index, _this.execFunctionGroupData);
                 if(cell != null && cell.f != null && cell.f == calc_funcStr){
                     if(!(item instanceof Object)){
diff --git a/src/global/setdata.js b/src/global/setdata.js
index 4793c1384..a0760917d 100644
--- a/src/global/setdata.js
+++ b/src/global/setdata.js
@@ -58,6 +58,12 @@ function setcellvalue(r, c, d, v) {
         cell.m = vupdate.toString().substr(1);
         cell.ct = { "fa": "@", "t": "s" };
         cell.v = vupdate.toString().substr(1);
+        cell.qp = 1;
+    }
+    else if(cell.qp == 1){
+        cell.m = vupdate.toString();
+        cell.ct = { "fa": "@", "t": "s" };
+        cell.v = vupdate.toString();
     }
     else if(vupdate.toString().toUpperCase() === "TRUE"){
         cell.m = "TRUE";
diff --git a/src/store/index.js b/src/store/index.js
index 43e4e4090..3ac53ed79 100644
--- a/src/store/index.js
+++ b/src/store/index.js
@@ -124,6 +124,7 @@ const Store = {
     visibledatarow_unique:null,
 
     showGridLines:true,
+
 }
 
 export default Store;
\ No newline at end of file