diff --git a/src/main/java/com/sunyard/sge/database/SydApiSM4.java b/src/main/java/com/sunyard/sge/database/SydApiSM4.java
index 0d385a1..8e24524 100644
--- a/src/main/java/com/sunyard/sge/database/SydApiSM4.java
+++ b/src/main/java/com/sunyard/sge/database/SydApiSM4.java
@@ -98,72 +98,14 @@ public class SydApiSM4 {
             }
         }
         else {
-            if (0 == sourceWrap.array().length) {
-                if (plength<16||plength/16<2){
-                    ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + plength);
-                    bufferResult.put(sourceWrap);
-                    bufferResult.put(pcData);
-                    sourceWrap = bufferResult;
-                    return new byte[0];
-                }
-                    ByteBuffer buffer = ByteBuffer.wrap(pcData);
-                    int remainder = plength % 16;
-                    int intercept = plength - remainder - 16;
-                    byte[] bytes = new byte[intercept];
-                    ByteBuffer byteBuffer = buffer.get(bytes, 0, intercept);
-                    byte[] bytes1 = new byte[remainder];
-                    byteBuffer.get(bytes1);
-                    byte[] bytes2 = new byte[16];
-                    ByteBuffer byte1 = buffer.get(bytes2,0,16);
-                    dataResult=bytes2;
-                    this.pcdataResult = bytes;
-                    ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + remainder);
-                    bufferResult.put(bytes1);
-                    sourceWrap = bufferResult;
-
-                iPkgNum = 2;
-
-                return api.SYD_SM4_LongData(iKeyIndex, pcdataResult, iPkgNum, iFlag);
-
-            } else {
-                if (16 > pcData.length + sourceWrap.array().length
-                        ||
-                        (pcData.length + sourceWrap.array().length)/16<2
-                ) {
-                    ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + plength);
-                    bufferResult.put(sourceWrap.array());
-                    bufferResult.put(pcData);
-                    sourceWrap = bufferResult;
-                    return new byte[0];
-                } else if ((pcData.length + sourceWrap.array().length) % 16 == 0) {
-                    ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + plength);
-                    bufferResult.put(sourceWrap.array());
-                    bufferResult.put(pcData);
-                    byte[] bytes = SydSM4Mac.bytebuffer2ByteArray(bufferResult);
-                    return api.SYD_SM4_LongData(iKeyIndex, bytes, iPkgNum, iFlag);
-                } else {
-                    ByteBuffer bufferResult = ByteBuffer.allocate(sourceWrap.array().length + plength);
-                    bufferResult.put(sourceWrap.array());
-                    bufferResult.put(pcData);
-                    byte[] bytes = SydSM4Mac.bytebuffer2ByteArray(bufferResult);
-                    ByteBuffer buffer = ByteBuffer.wrap(bytes);
-                    int remainder = bytes.length % 16;
-                    int intercept = bytes.length - remainder - 16;
-                    byte[] pcdataByte = new byte[intercept];
-                    ByteBuffer byteBuffer = buffer.get(pcdataByte, 0, intercept);
-                    byte[] bytes1 = new byte[remainder];
-                    byteBuffer.get(bytes1);
-                    byte[] bytes2 = new byte[16];
-                    ByteBuffer byteBuffer2 = buffer.get(bytes2, 0, 16);
-                    this.dataResult = bytes2;
-                    this.pcdataResult = pcdataByte;
-                    ByteBuffer bufferResults = ByteBuffer.allocate(remainder);
-                    bufferResults.put(bytes1);
-                    sourceWrap = bufferResults;
-                    iPkgNum = 2;
-                    return api.SYD_SM4_LongData(iKeyIndex, pcdataResult, iPkgNum, iFlag);
-                }
+            if (pcData.length/16<2){
+                return new byte[0];
             }
+            int length=(pcData.length/16)-1;
+            byte[] bytes = new byte[16];
+            System.arraycopy(pcData,length*16,bytes,0,16);
+            System.out.println(bytes);
+            return null;
         }
 
     }
@@ -184,7 +126,7 @@ public class SydApiSM4 {
             ByteBuffer buffer = ByteBuffer.allocate(dataResult.length+sourceWrap.array().length);
             buffer.put(dataResult);
             buffer.put(sourceWrap.array());
-            byte[] bytes = api.SYD_SM4_LongData(iKeyIndex,buffer.array(), iPkgNum, iFlag);
+            byte[] bytes = api.SYD_SM4_LongData(iKeyIndex,dataResult, iPkgNum, iFlag);
             sourceWrap = null;
             return bytes;
         }