diff --git a/src/com/fr/plugin/demo/DemoChart.java b/src/com/fr/plugin/demo/DemoChart.java
index 2f13fcb..92c28b8 100644
--- a/src/com/fr/plugin/demo/DemoChart.java
+++ b/src/com/fr/plugin/demo/DemoChart.java
@@ -1,9 +1,8 @@
 package com.fr.plugin.demo;
 
-import com.fr.base.BaseFormula;
 import com.fr.extended.chart.AbstractChart;
-import com.fr.extended.chart.ExtendedHelper;
 import com.fr.extended.chart.HyperLinkPara;
+import com.fr.extended.chart.StringFormula;
 import com.fr.extended.chart.export.ExportProcessor;
 import com.fr.extended.chart.export.JSExportProcessor;
 import com.fr.general.GeneralUtils;
@@ -31,7 +30,7 @@ public class DemoChart extends AbstractChart<DemoDataConfig>{
     private static final String ID = "DEMO_CHART";
     private static final String NAME = "DEMO图表";
 
-    private BaseFormula titleFormula;
+    private StringFormula titleFormula = new StringFormula();
 
     private ThemeType themeType = ThemeType.DARK;
 
@@ -53,11 +52,11 @@ public class DemoChart extends AbstractChart<DemoDataConfig>{
         this.themeType = themeType;
     }
 
-    public BaseFormula getTitleFormula() {
+    public StringFormula getTitleFormula() {
         return titleFormula;
     }
 
-    public void setTitleFormula(BaseFormula titleFormula) {
+    public void setTitleFormula(StringFormula titleFormula) {
         this.titleFormula = titleFormula;
     }
 
@@ -66,7 +65,7 @@ public class DemoChart extends AbstractChart<DemoDataConfig>{
         super.readAttr(reader);
         this.setThemeType(ThemeType.parseInt(reader.getAttrAsInt("theme", 0)));
         this.setThreeDimensional(reader.getAttrAsBoolean("threeD", false));
-        this.setTitleFormula(ExtendedHelper.readFormula(reader, "title"));
+        this.getTitleFormula().readAttr("title", reader);
     }
 
     @Override
@@ -74,7 +73,7 @@ public class DemoChart extends AbstractChart<DemoDataConfig>{
         super.writeAttr(writer);
         writer.attr("theme", getThemeType().ordinal());
         writer.attr("threeD", isThreeDimensional());
-        ExtendedHelper.writeFormula(this.getTitleFormula(), writer, "title");
+        this.getTitleFormula().writeAttr("title", writer);
     }
 
     @Override
@@ -123,7 +122,7 @@ public class DemoChart extends AbstractChart<DemoDataConfig>{
     protected void addJSON(DemoDataConfig dataConfig, JSONObject jsonObject, Repository repo) throws JSONException {
         jsonObject.put("theme", getThemeType() == ThemeType.DARK ? "dark" : "sth whatever");
 
-        jsonObject.put("title", JSONFactory.createJSON(JSON.OBJECT).put("text", ExtendedHelper.getFormulaResult(titleFormula)));
+        jsonObject.put("title", JSONFactory.createJSON(JSON.OBJECT).put("text", getTitleFormula().getResult()));
 
         JSONArray array = JSONFactory.createJSON(JSON.ARRAY);
 
@@ -229,8 +228,8 @@ public class DemoChart extends AbstractChart<DemoDataConfig>{
     }
 
     @Override
-    protected List<BaseFormula> formulas() {
-        List<BaseFormula> list = new ArrayList<BaseFormula>();
+    protected List<StringFormula> formulas() {
+        List<StringFormula> list = new ArrayList<StringFormula>();
         list.add(this.getTitleFormula());
         return list;
     }
diff --git a/src/com/fr/plugin/demo/DemoTitlePane.java b/src/com/fr/plugin/demo/DemoTitlePane.java
index 3798255..2c54280 100644
--- a/src/com/fr/plugin/demo/DemoTitlePane.java
+++ b/src/com/fr/plugin/demo/DemoTitlePane.java
@@ -1,7 +1,6 @@
 package com.fr.plugin.demo;
 
 import com.fr.design.formula.TinyFormulaPane;
-import com.fr.extended.chart.ExtendedHelper;
 import com.fr.extended.chart.ExtendedScrollPane;
 
 import javax.swing.JPanel;
@@ -14,12 +13,12 @@ public class DemoTitlePane extends ExtendedScrollPane<DemoChart>{
     private TinyFormulaPane title;
     @Override
     public void populateBean(DemoChart ob) {
-        title.populateBean(ExtendedHelper.formulaToString(ob.getTitleFormula()));
+        title.populateBean(ob.getTitleFormula().getContent());
     }
 
     @Override
     public void updateBean(DemoChart ob) {
-        ob.setTitleFormula(ExtendedHelper.stringToFormula(title.updateBean()));
+        ob.getTitleFormula().setContent(title.updateBean());
     }
 
     @Override