diff --git a/src/com/msb/ResourcesMgr.java b/src/com/msb/ResourcesMgr.java
index 4e73a48..7c4f241 100644
--- a/src/com/msb/ResourcesMgr.java
+++ b/src/com/msb/ResourcesMgr.java
@@ -1,5 +1,7 @@
 package com.msb;
 
+import com.msb.util.ImageUtil;
+
 import javax.imageio.ImageIO;
 import java.awt.image.BufferedImage;
 import java.io.IOException;
@@ -12,21 +14,27 @@ import java.io.IOException;
  */
 public class ResourcesMgr {
 
-    public static BufferedImage tankL, tankR, tankU, tankD;
+    public static BufferedImage goodTankL, goodTankR, goodTankU, goodTankD;
+    public static BufferedImage badTankL, badTankR, badTankU, badTankD;
     public static BufferedImage bulletL, bulletR, bulletU, bulletD;
     public static BufferedImage [] explodeImages = new BufferedImage[16];
 
     static {
         try {
-            tankL = ImageIO.read(ResourcesMgr.class.getClassLoader().getResourceAsStream("images/tankL.gif"));
-            tankR = ImageIO.read(ResourcesMgr.class.getClassLoader().getResourceAsStream("images/tankR.gif"));
-            tankU = ImageIO.read(ResourcesMgr.class.getClassLoader().getResourceAsStream("images/tankU.gif"));
-            tankD = ImageIO.read(ResourcesMgr.class.getClassLoader().getResourceAsStream("images/tankD.gif"));
-
-            bulletL = ImageIO.read(ResourcesMgr.class.getClassLoader().getResourceAsStream("images/bulletL.gif"));
-            bulletR = ImageIO.read(ResourcesMgr.class.getClassLoader().getResourceAsStream("images/bulletR.gif"));
-            bulletU = ImageIO.read(ResourcesMgr.class.getClassLoader().getResourceAsStream("images/bulletU.gif"));
-            bulletD = ImageIO.read(ResourcesMgr.class.getClassLoader().getResourceAsStream("images/bulletD.gif"));
+            goodTankU = ImageIO.read(ResourcesMgr.class.getClassLoader().getResourceAsStream("images/GoodTank1.png"));
+            goodTankL = ImageUtil.rotateImage(goodTankU, -90);
+            goodTankR = ImageUtil.rotateImage(goodTankU, 90);
+            goodTankD = ImageUtil.rotateImage(goodTankU, 180);
+
+            badTankU = ImageIO.read(ResourcesMgr.class.getClassLoader().getResourceAsStream("images/BadTank1.png"));
+            badTankL = ImageUtil.rotateImage(badTankU, -90);
+            badTankR = ImageUtil.rotateImage(badTankU, 90);
+            badTankD = ImageUtil.rotateImage(badTankU, 180);
+
+            bulletU = ImageIO.read(ResourcesMgr.class.getClassLoader().getResourceAsStream("images/bulletU.png"));
+            bulletL = ImageUtil.rotateImage(bulletU, -90);
+            bulletR = ImageUtil.rotateImage(bulletU, 90);
+            bulletD = ImageUtil.rotateImage(bulletU, 180);
 
             for (int i=1; i<=explodeImages.length ; i++) {
                 explodeImages[i-1] = ImageIO.read(ResourcesMgr.class.getClassLoader().getResourceAsStream("images/e" + i + ".gif"));
diff --git a/src/com/msb/Tank.java b/src/com/msb/Tank.java
index 4084611..0ea3832 100644
--- a/src/com/msb/Tank.java
+++ b/src/com/msb/Tank.java
@@ -17,8 +17,8 @@ public class Tank {
     private boolean move = true;
     //为了解决能够在坦克中发射子弹，将创建的子弹通过坦克发射出来，那么需要在坦克类中持有游戏窗口的引用
     private TankFrame tankFrame;
-    public static final int WIDTH = ResourcesMgr.tankD.getWidth();
-    public static final int HEIGHT = ResourcesMgr.tankD.getHeight();
+    public static final int WIDTH = ResourcesMgr.goodTankU.getWidth();
+    public static final int HEIGHT = ResourcesMgr.goodTankU.getHeight();
     private boolean live = true;
     private Random random = new Random();
     private GroupEnum group = GroupEnum.BAD;
@@ -41,12 +41,13 @@ public class Tank {
         }
 
         switch (dir) {
-            case UP: g.drawImage(ResourcesMgr.tankU, x, y, null); break;
-            case DOWN: g.drawImage(ResourcesMgr.tankD, x, y, null); break;
-            case LEFT: g.drawImage(ResourcesMgr.tankL, x, y, null); break;
-            case RIGHT: g.drawImage(ResourcesMgr.tankR, x, y, null); break;
+            case UP: g.drawImage(this.group==GroupEnum.GOOD ? ResourcesMgr.goodTankU : ResourcesMgr.badTankU, x, y, null); break;
+            case DOWN: g.drawImage(this.group==GroupEnum.GOOD ? ResourcesMgr.goodTankD : ResourcesMgr.badTankD, x, y, null); break;
+            case LEFT: g.drawImage(this.group==GroupEnum.GOOD ? ResourcesMgr.goodTankL : ResourcesMgr.badTankL, x, y, null); break;
+            case RIGHT: g.drawImage(this.group==GroupEnum.GOOD ? ResourcesMgr.goodTankR : ResourcesMgr.badTankR, x, y, null); break;
             default: break;
         }
+
         moving();
     }
 
@@ -110,7 +111,9 @@ public class Tank {
 
     public void die() {
         this.live = false;
-        tankFrame.explodes.add(new Explode(this.x, this.y, tankFrame));
+        int eX = this.x + WIDTH/2 - Explode.WIDTH/2;
+        int eY = this.y + HEIGHT/2 - Explode.HEIGHT/2;
+        tankFrame.explodes.add(new Explode(eX, eY, tankFrame));
     }
 
     public GroupEnum getGroup() {
diff --git a/src/com/msb/util/ImageUtil.java b/src/com/msb/util/ImageUtil.java
new file mode 100644
index 0000000..48d9033
--- /dev/null
+++ b/src/com/msb/util/ImageUtil.java
@@ -0,0 +1,24 @@
+package com.msb.util;
+
+import java.awt.Graphics2D;
+import java.awt.RenderingHints;
+import java.awt.image.BufferedImage;
+
+public class ImageUtil {
+	public static BufferedImage rotateImage(final BufferedImage bufferedimage,
+            final int degree) {
+        int w = bufferedimage.getWidth();
+        int h = bufferedimage.getHeight();
+        int type = bufferedimage.getColorModel().getTransparency();
+        BufferedImage img;
+        Graphics2D graphics2d;
+        (graphics2d = (img = new BufferedImage(w, h, type))
+                .createGraphics()).setRenderingHint(
+                RenderingHints.KEY_INTERPOLATION,
+                RenderingHints.VALUE_INTERPOLATION_BILINEAR);
+        graphics2d.rotate(Math.toRadians(degree), w / 2, h / 2);
+        graphics2d.drawImage(bufferedimage, 0, 0, null);
+        graphics2d.dispose();
+        return img;
+    }
+}