diff --git a/src/main/java/racal/sunyard/main/SydApi4j.java b/src/main/java/racal/sunyard/main/SydApi4j.java
index be05f1d..ba818c6 100644
--- a/src/main/java/racal/sunyard/main/SydApi4j.java
+++ b/src/main/java/racal/sunyard/main/SydApi4j.java
@@ -1506,7 +1506,7 @@ public class SydApi4j implements SydApi {
 
         final ByteBuffer bbs = ByteBuffer.allocate(v + 1024);
 
-        int packSize = 4080; // 2048/3072/4080
+        int packSize = 4064; // 2048/3072/4064
         int packSizeDe = packSize + 16;
 //        int fm = (int) data.get("fullMode$option");
         int fm = (Integer) data.get("fullMode$option");
diff --git a/src/test/java/com/sunyard/sydapi/test/TestE0.java b/src/test/java/com/sunyard/sydapi/test/TestE0.java
index 73b164c..0a3fe90 100644
--- a/src/test/java/com/sunyard/sydapi/test/TestE0.java
+++ b/src/test/java/com/sunyard/sydapi/test/TestE0.java
@@ -2,6 +2,7 @@ package com.sunyard.sydapi.test;
 
 import com.sunyard.RetWrap;
 import org.junit.After;
+import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
 import racal.sunyard.main.SydApi4j;
@@ -11,14 +12,14 @@ import java.util.Arrays;
 public class TestE0 {
 
     private SydApi4j api;
-    private byte[] data = new byte[ 20 * 1024 * 1024 ];
+    private byte[] data = new byte[ 4 * 1024 -1 ];
     private byte[] iv = new byte[ 32 ];
 
     @Before
     public void before() {
         // 通过设置debug的属性开启debug，如果不设置则默认不打开
         System.setProperty("com.sunyard.sydapi4j.debug", "true");
-        api = (SydApi4j) new SydApi4j().connect("192.168.1.111", 8889, null, 1000, 1000, 2);
+        api = (SydApi4j) new SydApi4j().connect("172.16.18.59", 8889, null, 1000, 1000, 2);
         Arrays.fill( iv, (byte) 0x38 );
     }
 
@@ -38,8 +39,11 @@ public class TestE0 {
         long start = System.currentTimeMillis();
         RetWrap retWrap = this.api.SYMEnDeData(true, 1, sessionKeyByLMK, 1, 1, data, iv, 0);
         byte[] enData = (byte[]) retWrap.get("msg_all");
+        retWrap = this.api.SYMEnDeData(false, 1, sessionKeyByLMK, 1, 1, enData, iv, 0);
+        byte[] oData = (byte[]) retWrap.get("msg_all");
         long end = System.currentTimeMillis();
         System.out.println( "耗时=" + ( end - start ) );
+        Assert.assertArrayEquals( oData, data );
     }
 
 }