diff --git a/source/src/main/java/io/mycat/mycat2/MySQLSession.java b/source/src/main/java/io/mycat/mycat2/MySQLSession.java
index 8702984..bd91703 100644
--- a/source/src/main/java/io/mycat/mycat2/MySQLSession.java
+++ b/source/src/main/java/io/mycat/mycat2/MySQLSession.java
@@ -6,6 +6,7 @@
 import java.nio.channels.SocketChannel;
 
 import io.mycat.mycat2.beans.*;
+import io.mycat.mysql.AutoCommit;
 import io.mycat.mysql.Capabilities;
 import io.mycat.mysql.Isolation;
 import io.mycat.mysql.packet.HandshakePacket;
@@ -50,6 +51,11 @@ public class MySQLSession extends UserProxySession {
 	 */
 	public Isolation isolation = Isolation.REPEATED_READ;
 
+    /**
+     * 事务提交方式
+     */
+	public AutoCommit autoCommit = AutoCommit.OFF;
+
 	/**
 	 * 认证中的seed报文数据
 	 */
@@ -82,7 +88,7 @@ protected int getServerCapabilities() {
 
 	/**
 	 * 回应客户端（front或Sever）OK 报文。
-	 * 
+	 *
 	 * @param pkg
 	 *            ，必须要是OK报文或者Err报文
 	 * @throws IOException
@@ -103,7 +109,7 @@ public void responseOKOrError(MySQLPacket pkg, boolean front) throws IOException
 
 	/**
 	 * 给客户端（front）发送认证报文
-	 * 
+	 *
 	 * @throws IOException
 	 */
 	public void sendAuthPackge() throws IOException {
@@ -141,7 +147,7 @@ public MySQLSession(BufferPool bufPool, Selector nioSelector, SocketChannel fron
 
 	/**
 	 * 向前端发送数据报文,需要先确定为Write状态并确保写入位置的正确（frontBuffer.writeState)
-	 * 
+	 *
 	 * @param rawPkg
 	 * @throws IOException
 	 */
@@ -154,7 +160,7 @@ public void answerFront(byte[] rawPkg) throws IOException {
 	/**
 	 * 解析MySQL报文，解析的结果存储在curMSQLPackgInf中，如果解析到完整的报文，就返回TRUE
 	 * 如果解析的过程中同时要移动ProxyBuffer的readState位置，即标记为读过，后继调用开始解析下一个报文，则需要参数markReaded=true
-	 * 
+	 *
 	 * @param proxyBuf
 	 * @return
 	 * @throws IOException
diff --git a/source/src/main/java/io/mycat/mycat2/net/DefaultMycatSessionHandler.java b/source/src/main/java/io/mycat/mycat2/net/DefaultMycatSessionHandler.java
index 2f8893b..6ecb170 100644
--- a/source/src/main/java/io/mycat/mycat2/net/DefaultMycatSessionHandler.java
+++ b/source/src/main/java/io/mycat/mycat2/net/DefaultMycatSessionHandler.java
@@ -134,7 +134,7 @@ public void onBackendRead(MySQLSession session) throws IOException {
 
 		ProxyBuffer backendBuffer = session.frontBuffer;
 
-		if (session.resolveMySQLPackage(backendBuffer, session.curFrontMSQLPackgInf, false) == false||!session.curFrontMSQLPackgInf.crossBuffer) {
+		if (session.resolveMySQLPackage(backendBuffer, session.curFrontMSQLPackgInf, false) == false && !session.curFrontMSQLPackgInf.crossBuffer) {
 			// 没有读到完整报文, 也不是挎包
 			return;
 		}
diff --git a/source/src/main/java/io/mycat/mycat2/tasks/BackendSynchronzationTask.java b/source/src/main/java/io/mycat/mycat2/tasks/BackendSynchronzationTask.java
index a876e75..2ee0b9a 100644
--- a/source/src/main/java/io/mycat/mycat2/tasks/BackendSynchronzationTask.java
+++ b/source/src/main/java/io/mycat/mycat2/tasks/BackendSynchronzationTask.java
@@ -11,81 +11,55 @@
 import io.mycat.mysql.packet.QueryPacket;
 import io.mycat.proxy.ProxyBuffer;
 
+import javax.management.Query;
+
 /**
  * Created by ynfeng on 2017/8/13.
  * <p>
  * 同步状态至后端数据库，包括：字符集，事务，隔离级别等
  */
 public class BackendSynchronzationTask extends AbstractBackendIOTask {
-	private static Logger logger = LoggerFactory.getLogger(BackendSynchronzationTask.class);
-	private static QueryPacket[] CMDS = new QueryPacket[3];
-	private int processCmd = 0;
-
-	static {
-		QueryPacket isolationSynCmd = new QueryPacket();
-		isolationSynCmd.packetId = 0;
-
-		QueryPacket charsetSynCmd = new QueryPacket();
-		charsetSynCmd.packetId = 0;
-
-		QueryPacket transactionSynCmd = new QueryPacket();
-		transactionSynCmd.packetId = 0;
-
-		CMDS[0] = isolationSynCmd;
-		CMDS[1] = charsetSynCmd;
-		CMDS[2] = transactionSynCmd;
-	}
-
-	public BackendSynchronzationTask(MySQLSession session) throws IOException {
-		super(session);
-		this.processCmd = 0;
-		syncState(session);
-	}
-
-	private void syncState(MySQLSession session) throws IOException {
-		logger.info("synchronzation state to bakcend.session=" + session.toString());
-		ProxyBuffer frontBuffer = session.frontBuffer;
-		frontBuffer.reset();
-		// TODO 字符集映射和前端事务设置还未完成，这里只用隔离级别模拟实现(其实都是SET xxx效果一样)，回头补充
-		switch (processCmd) {
-		case 1:
-		case 2:
-		case 0:
-			CMDS[processCmd].sql = session.isolation.getCmd();
-			CMDS[processCmd].write(frontBuffer);
+    private static Logger logger = LoggerFactory.getLogger(BackendSynchronzationTask.class);
 
-			frontBuffer.flip();
-			session.writeToChannel(frontBuffer, session.backendChannel);
-			processCmd++;
-			break;
-		default:
-			this.finished(true);
-			break;
-		}
+    public BackendSynchronzationTask(MySQLSession session) throws IOException {
+        super(session);
+        syncState(session);
+    }
 
-	}
+    private void syncState(MySQLSession session) throws IOException {
+        logger.info("synchronzation state to bakcend.session=" + session.toString());
+        ProxyBuffer frontBuffer = session.frontBuffer;
+        frontBuffer.reset();
+        // TODO 字符集映射未完成
+        QueryPacket queryPacket = new QueryPacket();
+        queryPacket.packetId = 0;
+        queryPacket.sql = session.isolation.getCmd() + session.autoCommit.getCmd() + session.isolation.getCmd();
+        queryPacket.write(frontBuffer);
+        frontBuffer.flip();
+        session.writeToChannel(frontBuffer, session.backendChannel);
+    }
 
-	@Override
-	public void onBackendRead(MySQLSession session) throws IOException {
-		session.frontBuffer.reset();
-		if (!session.readFromChannel(session.frontBuffer, session.backendChannel)
-				|| !session.resolveMySQLPackage(session.frontBuffer, session.curBackendMSQLPackgInf, false)) {// 没有读到数据或者报文不完整
-			return;
-		}
-		if (session.curBackendMSQLPackgInf.pkgType == MySQLPacket.OK_PACKET) {
-			syncState(session);
-		} else {
-			// TODO 同步失败如何处理？？是否应该关闭此连接？？
-			errPkg = new ErrorPacket();
-			errPkg.read(session.frontBuffer);
-			logger.warn("backend state sync Error.Err No. " + errPkg.errno + "," + errPkg.message);
-			this.finished(false);
-		}
-	}
+    @Override
+    public void onBackendRead(MySQLSession session) throws IOException {
+        session.frontBuffer.reset();
+        if (!session.readFromChannel(session.frontBuffer, session.backendChannel)
+                || !session.resolveMySQLPackage(session.frontBuffer, session.curBackendMSQLPackgInf, false)) {// 没有读到数据或者报文不完整
+            return;
+        }
+        if (session.curBackendMSQLPackgInf.pkgType == MySQLPacket.OK_PACKET) {
+            session.frontBuffer.reset();
+            this.finished(true);
+        } else {
+            errPkg = new ErrorPacket();
+            errPkg.read(session.frontBuffer);
+            logger.warn("backend state sync Error.Err No. " + errPkg.errno + "," + errPkg.message);
+            this.finished(false);
+        }
+    }
 
-	@Override
-	public void onBackendSocketClosed(MySQLSession userSession, boolean normal) {
-		logger.warn(" socket closed not handlerd" + session.toString());
-	}
+    @Override
+    public void onBackendSocketClosed(MySQLSession userSession, boolean normal) {
+        logger.warn(" socket closed not handlerd" + session.toString());
+    }
 
 }
diff --git a/source/src/main/java/io/mycat/mysql/AutoCommit.java b/source/src/main/java/io/mycat/mysql/AutoCommit.java
new file mode 100644
index 0000000..c9d1b1f
--- /dev/null
+++ b/source/src/main/java/io/mycat/mysql/AutoCommit.java
@@ -0,0 +1,19 @@
+package io.mycat.mysql;
+
+/**
+ * Created by ynfeng on 2017/8/19.
+ */
+public enum AutoCommit {
+    ON("SET autocommit = 1;"),
+    OFF("SET autocommit = 0;");
+
+    AutoCommit(String cmd) {
+        this.cmd = cmd;
+    }
+
+    private String cmd;
+
+    public String getCmd() {
+        return cmd;
+    }
+}
diff --git a/source/src/main/java/io/mycat/mysql/Isolation.java b/source/src/main/java/io/mycat/mysql/Isolation.java
index b382f4b..277063f 100644
--- a/source/src/main/java/io/mycat/mysql/Isolation.java
+++ b/source/src/main/java/io/mycat/mysql/Isolation.java
@@ -44,9 +44,5 @@ public enum Isolation {
     public String getCmd() {
         return cmd;
     }
-
-    public void setCmd(String cmd) {
-        this.cmd = cmd;
-    }
 }