diff --git a/designer-base/src/main/java/com/fr/file/filter/ChooseFileFilter.java b/designer-base/src/main/java/com/fr/file/filter/ChooseFileFilter.java
index a25ebe7b6..147e1946d 100644
--- a/designer-base/src/main/java/com/fr/file/filter/ChooseFileFilter.java
+++ b/designer-base/src/main/java/com/fr/file/filter/ChooseFileFilter.java
@@ -4,6 +4,8 @@ import com.fr.base.extension.FileExtension;
 import com.fr.file.FILE;
 import com.fr.file.FileFILE;
 import com.fr.general.ComparatorUtils;
+import com.fr.stable.CoreConstants;
+import com.fr.stable.StringUtils;
 
 import javax.swing.filechooser.FileFilter;
 import java.io.File;
@@ -275,25 +277,25 @@ public class ChooseFileFilter extends FileFilter implements FILEFilter, java.io.
     }
 
     /**
+     * 默认情况下 返回首位的后缀名
      * get extention.
      */
     public String getExtensionString() {
-        if (filters == null) {
-            return "";
-        }
-
-        StringBuffer extsb = new StringBuffer(".");
-
-//        Enumeration keys = filters.keys();
-//        while (keys.hasMoreElements()) {
-//            extsb.append((String) keys.nextElement());
-//        }
+        return getExtensionString(0);
+    }
 
-        for (int i = 0; i < filters.size(); i++) {
-            extsb.append(filters.get(i));
+    public String getExtensionString(int index) {
+        if (filters == null || filters.isEmpty() || index >= filters.size()) {
+            return StringUtils.EMPTY;
         }
+        return CoreConstants.DOT + filters.get(index);
+    }
 
-        return extsb.toString();
+    public int getExtensionCount() {
+        if (filters == null || filters.isEmpty()) {
+            return 0;
+        }
+        return filters.size();
     }
 
     /**
diff --git a/designer-base/src/test/java/com/fr/file/FILEChooserPaneTest.java b/designer-base/src/test/java/com/fr/file/FILEChooserPaneTest.java
index 79a3ea0f2..064cd05ce 100644
--- a/designer-base/src/test/java/com/fr/file/FILEChooserPaneTest.java
+++ b/designer-base/src/test/java/com/fr/file/FILEChooserPaneTest.java
@@ -39,6 +39,16 @@ public class FILEChooserPaneTest {
         String result6 = Reflect.on(chooserPane).call("calProperFileName", "WorkBook1.xls", chooseFileFilter6).get();
         Assert.assertEquals("WorkBook1.xls.cpt", result6);
 
+        ChooseFileFilter chooseFileFilter7 = new ChooseFileFilter(FileExtension.XLS, StringUtils.EMPTY);
+        chooseFileFilter7.addExtension(".xlsx");
+        String result7 = Reflect.on(chooserPane).call("calProperFileName", "WorkBook1", chooseFileFilter7).get();
+        Assert.assertEquals("WorkBook1.xls", result7);
+
+        ChooseFileFilter chooseFileFilter8 = new ChooseFileFilter(FileExtension.XLSX, StringUtils.EMPTY);
+        chooseFileFilter8.addExtension(".xls");
+        String result8 = Reflect.on(chooserPane).call("calProperFileName", "WorkBook1", chooseFileFilter8).get();
+        Assert.assertEquals("WorkBook1.xlsx", result8);
+
     }
 
 }
diff --git a/designer-base/src/test/java/com/fr/file/filter/ChooseFileFilterTest.java b/designer-base/src/test/java/com/fr/file/filter/ChooseFileFilterTest.java
new file mode 100644
index 000000000..ec6779bab
--- /dev/null
+++ b/designer-base/src/test/java/com/fr/file/filter/ChooseFileFilterTest.java
@@ -0,0 +1,33 @@
+package com.fr.file.filter;
+
+import com.fr.base.extension.FileExtension;
+import com.fr.stable.CoreConstants;
+import com.fr.stable.StringUtils;
+import junit.framework.TestCase;
+import org.junit.Assert;
+
+
+/**
+ * @author hades
+ * @version 10.0
+ * Created by hades on 2020/3/18
+ */
+public class ChooseFileFilterTest extends TestCase {
+
+    public void testGetExtensionString() {
+        ChooseFileFilter chooseFileFilter = new ChooseFileFilter(FileExtension.XLSX, StringUtils.EMPTY);
+        chooseFileFilter.addExtension(FileExtension.XLS.getExtension());
+        Assert.assertEquals(CoreConstants.DOT + FileExtension.XLSX.getExtension(), chooseFileFilter.getExtensionString());
+        Assert.assertEquals(CoreConstants.DOT + FileExtension.XLS.getExtension(), chooseFileFilter.getExtensionString(1));
+        ChooseFileFilter chooseFileFilter1 = new ChooseFileFilter();
+        Assert.assertEquals(StringUtils.EMPTY, chooseFileFilter1.getExtensionString());
+        Assert.assertEquals(StringUtils.EMPTY, chooseFileFilter1.getExtensionString(1));
+
+    }
+
+    public void testGetExtensionCount() {
+        ChooseFileFilter chooseFileFilter = new ChooseFileFilter(FileExtension.CPT, StringUtils.EMPTY);
+        chooseFileFilter.addExtension(FileExtension.CPTX.getExtension());
+        Assert.assertEquals(2, chooseFileFilter.getExtensionCount());
+    }
+}
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