diff --git a/designer-base/src/main/java/com/fr/design/data/datapane/connect/JDBCDefPane.java b/designer-base/src/main/java/com/fr/design/data/datapane/connect/JDBCDefPane.java
index 3349581248..022323f194 100644
--- a/designer-base/src/main/java/com/fr/design/data/datapane/connect/JDBCDefPane.java
+++ b/designer-base/src/main/java/com/fr/design/data/datapane/connect/JDBCDefPane.java
@@ -7,6 +7,7 @@ import com.fr.data.impl.JDBCDatabaseConnection;
 import com.fr.design.border.UITitledBorder;
 import com.fr.design.gui.ibutton.UIButton;
 import com.fr.design.gui.icombobox.UIComboBox;
+import com.fr.design.gui.icombobox.UIComboBoxUI;
 import com.fr.design.gui.ilable.ActionLabel;
 import com.fr.design.gui.ilable.UILabel;
 import com.fr.design.gui.ipasswordfield.UIPasswordFieldWithFixedLength;
@@ -32,6 +33,8 @@ import javax.swing.JPanel;
 import javax.swing.JPasswordField;
 import javax.swing.event.DocumentEvent;
 import javax.swing.event.DocumentListener;
+import javax.swing.plaf.ComboBoxUI;
+import javax.swing.plaf.basic.ComboPopup;
 import java.awt.BorderLayout;
 import java.awt.Color;
 import java.awt.Component;
@@ -275,8 +278,9 @@ public class JDBCDefPane extends JPanel {
         }
         dbtypeComboBox.addActionListener(dbtypeActionListener);
         dbtypeComboBox.setMaximumRowCount(10);
-        driverLoaderBox = new UIComboBox();
+        driverLoaderBox = new SpecialUIComboBox();
         refreshDriverLoader();
+        driverLoaderBox.setPreferredSize(new Dimension(200, driverLoaderBox.getPreferredSize().height));
         driverLoaderBox.setEditable(false);
         driverManageBox = new UIComboBox();
         refreshDriverManage(true);
@@ -717,4 +721,22 @@ public class JDBCDefPane extends JPanel {
         private String driver;
         private String url;
     }
+
+    private static class SpecialUIComboBox extends UIComboBox {
+
+        @Override
+        public ComboBoxUI getUIComboBoxUI() {
+            return new SpecialUIComboBoxUI();
+        }
+    }
+
+    private static class SpecialUIComboBoxUI extends UIComboBoxUI {
+
+        @Override
+        public ComboPopup createPopup() {
+            return createHorizontalNeverUIComboPopUp();
+        }
+
+    }
+
 }
diff --git a/designer-base/src/main/java/com/fr/design/gui/icombobox/UIComboBoxUI.java b/designer-base/src/main/java/com/fr/design/gui/icombobox/UIComboBoxUI.java
index f15bbc52a0..d4de4e8501 100644
--- a/designer-base/src/main/java/com/fr/design/gui/icombobox/UIComboBoxUI.java
+++ b/designer-base/src/main/java/com/fr/design/gui/icombobox/UIComboBoxUI.java
@@ -10,12 +10,26 @@ import com.fr.stable.Constants;
 import com.fr.stable.StringUtils;
 import sun.swing.DefaultLookup;
 
-import javax.swing.*;
+import javax.swing.AbstractButton;
+import javax.swing.JComboBox;
+import javax.swing.JComponent;
+import javax.swing.JList;
+import javax.swing.JPanel;
+import javax.swing.JScrollPane;
+import javax.swing.ListCellRenderer;
+import javax.swing.ScrollPaneConstants;
+import javax.swing.UIManager;
 import javax.swing.plaf.ButtonUI;
 import javax.swing.plaf.basic.BasicComboBoxUI;
 import javax.swing.plaf.basic.BasicComboPopup;
 import javax.swing.plaf.basic.ComboPopup;
-import java.awt.*;
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.Point;
+import java.awt.Rectangle;
+import java.awt.RenderingHints;
 import java.awt.event.MouseEvent;
 import java.awt.event.MouseListener;
 
@@ -159,6 +173,10 @@ public class UIComboBoxUI extends BasicComboBoxUI implements MouseListener {
         return new UIComboPopup(comboBox);
     }
 
+    protected ComboPopup createHorizontalNeverUIComboPopUp() {
+        return new HorizontalNeverUIComboPopup(comboBox);
+    }
+
     private void setRollover(boolean isRollover) {
         if (this.isRollover != isRollover) {
             this.isRollover = isRollover;
@@ -270,4 +288,16 @@ public class UIComboBoxUI extends BasicComboBoxUI implements MouseListener {
         }
 
     }
+
+    private class HorizontalNeverUIComboPopup extends UIComboPopup {
+
+        public HorizontalNeverUIComboPopup(JComboBox comboBox) {
+            super(comboBox);
+        }
+
+        @Override
+        protected JScrollPane createScroller() {
+            return new UIScrollPane(list, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
+        }
+    }
 }
\ No newline at end of file
diff --git a/designer-base/src/main/java/com/fr/design/gui/icontainer/UIScrollPane.java b/designer-base/src/main/java/com/fr/design/gui/icontainer/UIScrollPane.java
index a14c10f3c4..55ba64b0e9 100644
--- a/designer-base/src/main/java/com/fr/design/gui/icontainer/UIScrollPane.java
+++ b/designer-base/src/main/java/com/fr/design/gui/icontainer/UIScrollPane.java
@@ -3,8 +3,11 @@ package com.fr.design.gui.icontainer;
 import com.fr.design.constants.UIConstants;
 import com.fr.design.gui.iscrollbar.UIScrollBar;
 
-import javax.swing.*;
-import java.awt.*;
+import javax.swing.JScrollBar;
+import javax.swing.JScrollPane;
+import javax.swing.ScrollPaneConstants;
+import java.awt.Color;
+import java.awt.Component;
 
 /**
  * @author zhou
@@ -16,7 +19,11 @@ public class UIScrollPane extends JScrollPane {
     private static final int INCREAMENT = 30;
 
     public UIScrollPane(Component c) {
-        super(c, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
+        this(c, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
+    }
+
+    public UIScrollPane(Component c, int vertical, int horizontal) {
+        super(c, vertical, horizontal);
         this.setHorizontalScrollBar(createHorizontalScrollBar());
         this.getVerticalScrollBar().setUnitIncrement(INCREAMENT);
         this.getVerticalScrollBar().setBlockIncrement(INCREAMENT);