diff --git a/src/main/java/com/fanruan/api/cal/FormulaKit.java b/src/main/java/com/fanruan/api/cal/FormulaKit.java
index 93cd52a..503a8ab 100644
--- a/src/main/java/com/fanruan/api/cal/FormulaKit.java
+++ b/src/main/java/com/fanruan/api/cal/FormulaKit.java
@@ -7,6 +7,7 @@ import com.fr.base.ScriptFormula;
 import com.fr.log.FineLoggerFactory;
 import com.fr.script.Calculator;
 import com.fr.stable.FormulaProvider;
+import com.fr.stable.StableUtils;
 import com.fr.stable.StringUtils;
 import com.fr.stable.UtilEvalError;
 import com.fr.stable.script.CalculatorProvider;
@@ -104,4 +105,14 @@ public class FormulaKit {
         }
         return checkFormulaContent(formula.getPureContent());
     }
+
+    /**
+     * 判断一个对象是否可以转化为公式
+     * @param object 要判断的字符串
+     * @return 如果该字符串是以"="开头，说明可以转化成公式，否则不能转化成公式
+     */
+    public static boolean canBeFormula(Object object){
+        return StableUtils.canBeFormula(object);
+    }
+
 }
diff --git a/src/main/java/com/fanruan/api/util/CellKit.java b/src/main/java/com/fanruan/api/report/PaintKit.java
similarity index 93%
rename from src/main/java/com/fanruan/api/util/CellKit.java
rename to src/main/java/com/fanruan/api/report/PaintKit.java
index c007b5b..3b1787e 100644
--- a/src/main/java/com/fanruan/api/util/CellKit.java
+++ b/src/main/java/com/fanruan/api/report/PaintKit.java
@@ -1,11 +1,11 @@
-package com.fanruan.api.util;
+package com.fanruan.api.report;
 
 import com.fr.base.Style;
 import com.fr.report.cell.cellattr.core.CellUtils;
 
 import java.awt.*;
 
-public class CellKit {
+public class PaintKit {
 
     /**
      *  如果value是ImageWithSuffix类的一个实例，则创建一个宽为width，高为height,类型为TYPE_4BYTE_ABGR的image,并将其按照比例和Style绘制。
diff --git a/src/main/java/com/fanruan/api/util/StableKit.java b/src/main/java/com/fanruan/api/util/StableKit.java
deleted file mode 100644
index 1a67501..0000000
--- a/src/main/java/com/fanruan/api/util/StableKit.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package com.fanruan.api.util;
-
-import com.fr.stable.StableUtils;
-
-public class StableKit {
-
-    /**
-     * 判断一个对象是否可以转化为公式
-     * @param object 要判断的字符串
-     * @return 如果该字符串是以"="开头，说明可以转化成公式，否则不能转化成公式
-     */
-    public static boolean canBeFormula(Object object){
-        return StableUtils.canBeFormula(object);
-    }
-}
diff --git a/src/test/java/com/fanruan/api/cal/FormulaKitTest.java b/src/test/java/com/fanruan/api/cal/FormulaKitTest.java
index abed6cb..f2faf24 100644
--- a/src/test/java/com/fanruan/api/cal/FormulaKitTest.java
+++ b/src/test/java/com/fanruan/api/cal/FormulaKitTest.java
@@ -72,4 +72,14 @@ public class FormulaKitTest extends Prepare {
         assertEquals(true, FormulaKit.checkFormulaContent(new Formula("=")));
         assertEquals(false, FormulaKit.checkFormulaContent("="));
     }
+
+    @Test
+    public void canBeFormula() {
+        String s1 = "=1";
+        String s2 = "=a+b+";
+        String s3 = "ppp";
+        Assert.assertTrue(FormulaKit.canBeFormula(s1));
+        Assert.assertTrue(FormulaKit.canBeFormula(s2));
+        Assert.assertFalse(FormulaKit.canBeFormula(s3));
+    }
 }
\ No newline at end of file
diff --git a/src/test/java/com/fanruan/api/util/CellKitTest.java b/src/test/java/com/fanruan/api/util/PaintKitTest.java
similarity index 75%
rename from src/test/java/com/fanruan/api/util/CellKitTest.java
rename to src/test/java/com/fanruan/api/util/PaintKitTest.java
index 5d22589..33e2c17 100644
--- a/src/test/java/com/fanruan/api/util/CellKitTest.java
+++ b/src/test/java/com/fanruan/api/util/PaintKitTest.java
@@ -1,5 +1,6 @@
 package com.fanruan.api.util;
 
+import com.fanruan.api.report.PaintKit;
 import com.fr.base.Style;
 import com.fr.plugin.present.fun.StarPainter;
 import org.junit.Assert;
@@ -7,15 +8,13 @@ import org.junit.Test;
 
 import java.awt.*;
 
-import static org.junit.Assert.*;
-
-public class CellKitTest {
+public class PaintKitTest {
 
     @Test
     public void value2Image() {
         StarPainter star = new StarPainter(1);
         Style style = Style.getInstance();
-        Image image = CellKit.value2Image(star, 1, style, 30, 50);
+        Image image = PaintKit.value2Image(star, 1, style, 30, 50);
         Assert.assertEquals(30, image.getWidth(null));
         Assert.assertEquals(50, image.getHeight(null));
     }
diff --git a/src/test/java/com/fanruan/api/util/StableKitTest.java b/src/test/java/com/fanruan/api/util/StableKitTest.java
deleted file mode 100644
index 753edd3..0000000
--- a/src/test/java/com/fanruan/api/util/StableKitTest.java
+++ /dev/null
@@ -1,19 +0,0 @@
-package com.fanruan.api.util;
-
-import org.junit.Assert;
-import org.junit.Test;
-
-import static org.junit.Assert.*;
-
-public class StableKitTest {
-
-    @Test
-    public void canBeFormula() {
-        String s1 = "=1";
-        String s2 = "=a+b+";
-        String s3 = "ppp";
-        Assert.assertTrue(StableKit.canBeFormula(s1));
-        Assert.assertTrue(StableKit.canBeFormula(s2));
-        Assert.assertFalse(StableKit.canBeFormula(s3));
-    }
-}
\ No newline at end of file