diff --git a/src/main/java/com/sunyard/sge/database/SydApiSM4.java b/src/main/java/com/sunyard/sge/database/SydApiSM4.java
index a04077c..544eaab 100644
--- a/src/main/java/com/sunyard/sge/database/SydApiSM4.java
+++ b/src/main/java/com/sunyard/sge/database/SydApiSM4.java
@@ -14,7 +14,7 @@ public class SydApiSM4 {
     private boolean is_finished = false;
     private byte[] dataResult = new byte[0];
 
-    ByteBuffer sourceWrap = ByteBuffer.wrap(new byte[1]);
+    ByteBuffer sourceWrap = ByteBuffer.wrap(new byte[0]);
 
 
     public SydApiSM4(SydApi api, int iKeyIndex, int endeFlag) {
@@ -59,9 +59,9 @@ public class SydApiSM4 {
                     bufferResult.put(bytes1);
                     sourceWrap = bufferResult;
                 }
-
+                byte[] bytes = api.SYD_SM4_LongData(iKeyIndex, pcdataResult, iPkgNum, iFlag);
                 iPkgNum = 2;
-                return api.SYD_SM4_LongData(iKeyIndex, pcdataResult, iPkgNum, iFlag);
+                return bytes;
 
             } else {
                 if (16 > pcData.length + sourceWrap.array().length) {
@@ -75,7 +75,9 @@ public class SydApiSM4 {
                     bufferResult.put(sourceWrap.array());
                     bufferResult.put(pcData);
                     byte[] bytes = SydSM4Mac.bytebuffer2ByteArray(bufferResult);
-                    return api.SYD_SM4_LongData(iKeyIndex, bytes, iPkgNum, iFlag);
+                    byte[] bytes1 = api.SYD_SM4_LongData(iKeyIndex, bytes, iPkgNum, iFlag);
+                    iPkgNum = 2;
+                    return bytes1;
                 } else {
                     ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + plength);
                     bufferResult.put(sourceWrap.array());
@@ -92,8 +94,10 @@ public class SydApiSM4 {
                     ByteBuffer bufferResults = ByteBuffer.allocate(remainder);
                     bufferResults.put(bytes1);
                     sourceWrap = bufferResults;
+
+                    byte[] bytes2 = api.SYD_SM4_LongData(iKeyIndex, pcdataResult, iPkgNum, iFlag);
                     iPkgNum = 2;
-                    return api.SYD_SM4_LongData(iKeyIndex, pcdataResult, iPkgNum, iFlag);
+                    return bytes2;
                 }
             }
         }
@@ -106,9 +110,10 @@ public class SydApiSM4 {
             dataResult = bytes;
             byte[] bytes1 = new byte[pcData.length-16];
             System.arraycopy(pcData,length*16,bytes,0,16);
-            System.arraycopy(pcData,1,bytes1,0,pcData.length-16);
+            System.arraycopy(pcData,0,bytes1,0,pcData.length-16);
+            byte[] bytes2 = api.SYD_SM4_LongData(iKeyIndex, bytes1, iPkgNum, iFlag);
             iPkgNum = 2;
-            return api.SYD_SM4_LongData(iKeyIndex,bytes1,iPkgNum,iFlag);
+            return bytes2;
         }
 
     }
@@ -126,14 +131,11 @@ public class SydApiSM4 {
 
 
         if (iFlag == 0){
-            ByteBuffer buffer = ByteBuffer.allocate(dataResult.length+sourceWrap.array().length);
-            buffer.put(dataResult);
-            buffer.put(sourceWrap.array());
             byte[] bytes = api.SYD_SM4_LongData(iKeyIndex,dataResult, iPkgNum, iFlag);
             sourceWrap = null;
             return bytes;
         }
-        byte[] bytes = api.SYD_SM4_LongData(iKeyIndex,dataResult, iPkgNum, iFlag);
+        byte[] bytes = api.SYD_SM4_LongData(iKeyIndex,sourceWrap.array(), iPkgNum, iFlag);
         sourceWrap = null;
         return bytes;
     }