diff --git a/monitor/src/CMakeLists.txt b/monitor/src/CMakeLists.txt
index 82cfc07..cdc1471 100644
--- a/monitor/src/CMakeLists.txt
+++ b/monitor/src/CMakeLists.txt
@@ -9,7 +9,7 @@ execute_process(WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/../deps/zookeeper COMMAN
 execute_process(WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/../deps/zookeeper COMMAND ./configure
     --prefix=${PROJECT_SOURCE_DIR}/../deps/zookeeper/_install)
 execute_process(WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/../deps/zookeeper COMMAND
-    make)
+    make -j24)
 execute_process(WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/../deps/zookeeper COMMAND
     make install)
 execute_process(WORKING_DIRECTORY
diff --git a/monitor/src/monitor.cc b/monitor/src/monitor.cc
index bff4be0..e9d0ded 100644
--- a/monitor/src/monitor.cc
+++ b/monitor/src/monitor.cc
@@ -18,12 +18,88 @@
 
 using namespace std;
 
-int main(int argc, char** argv){
+// TODO (gaodunqiao@360.cn) classify error
+int initMonitorEnv(Zk* _zk) {
     Config* conf = Config::getInstance();
-    Util::printConfig();
+    Process::clearStop();
+    conf->clearServiceMap();
+    string zkHost = conf->getZkHost();
+    string zkLogPath = conf->getZkLogPath();
+    int recvTimeout = conf->getZkRecvTimeout();
+
+    // init zookeeper handler
+    if (_zk->initEnv(zkHost, zkLogPath, recvTimeout) != M_OK) {
+        LOG(LOG_ERROR, "Zk init env failed, host:%s, zk log path:%s", zkHost.c_str(), zkLogPath.c_str());
+        return M_ERR;
+    }
+
+    //check qconf_monitor_lock_node/default_instance/md5_list
+    if (_zk->createZnode2(conf->getNodeList()) != M_OK) {
+        LOG(LOG_ERROR, "create znode %s failed", (conf->getNodeList()).c_str());
+        return M_ERR;
+    }
+
+    //check qconf_monitor_lock_node/default_instance/monitor_list
+    //if(_zk->checkAndCreateZnode(conf->getMonitorList()) == M_OK) {
+    if (_zk->createZnode2(conf->getMonitorList()) != M_OK) {
+        LOG(LOG_ERROR, "create znode %s failed", (conf->getMonitorList()).c_str());
+        return M_ERR;
+    }
+
+    // monitor register, this function should in LoadBalance
+    if (_zk->registerMonitor(conf->getMonitorList() + "/monitor_") != M_OK) {
+        LOG(LOG_ERROR, "Monitor register failed");
+        return M_ERR;
+    }
+    return M_OK;
+}
+
+// TODO classify error
+int doLoadBalance(LoadBalance *lb) {
+    LoadBalance::clearReBalance();
+    //load balance
+    if (lb->initEnv() != M_OK) {
+        LOG(LOG_ERROR, "init load balance env failed");
+        return M_ERR;
+    }
+
+    if (lb->getMd5ToServiceFather() != M_OK) {
+        LOG(LOG_ERROR, "get md5 to service father failed");
+        /*
+           how to deal with this in a better way?
+           if the reason of failure is node not exist, we should restart main loop
+           */
+        return M_ERR;
+    }
+
+    if (lb->getMonitors() != M_OK) {
+        LOG(LOG_ERROR, "get monitors failed");
+        return M_ERR;
+    }
+
+    if (lb->balance() != M_OK) {
+        LOG(LOG_ERROR, "balance failed");
+        return M_ERR;
+    }
+    return M_OK;
+}
+
+int loadServiceToConf(ServiceListener *sl) {
+    if (sl->initEnv() != M_OK) {
+        LOG(LOG_ERROR, "init service listener env failed");
+        return M_ERR;
+    }
+    sl->getAllIp();
+    sl->loadAllService();
+    return M_OK;
+}
+
+int main(int argc, char** argv) {
+    Config* conf = Config::getInstance();
+
     if (Process::isProcessRunning(MONITOR_PROCESS_NAME)) {
         LOG(LOG_ERROR, "Monitor is already running.");
-        return -1;
+        return M_ERR;
     }
     if (conf->isDaemonMode()) {
         Process::daemonize();
@@ -36,129 +112,33 @@ int main(int argc, char** argv){
             return childExitStatus;
         }
         else if (ret < 0) {
-            return -1;
+            return M_ERR;
         }
         else {
             //child process write pid to PIDFILE
-            if (Util::writePid(PIDFILE.c_str()) != 0) {
-                return -1;
+            if (Util::writePid(PIDFILE.c_str()) != M_OK) {
+                return M_ERR;
             }
         }
     }
 
     while (1) {
         LOG(LOG_INFO, " main loop start -> !!!!!!");
-        Process::clearStop();
-        conf->clearServiceMap();
         Zk* _zk = Zk::getInstance();
-        string zkHost = conf->getZkHost();
-        string zkLogPath = conf->getZkLogPath();
-        int recvTimeout = conf->getZkRecvTimeout();
-
-        // init zookeeper handler
-        if (_zk->initEnv(zkHost, zkLogPath, recvTimeout) == M_OK) {
-            LOG(LOG_INFO, "Zk init env succeeded. host:%s zk log path:%s", zkHost.c_str(), zkLogPath.c_str());
-        }
-        else {
-            LOG(LOG_ERROR, "Zk init env failed, host:%s, zk log path:%s", zkHost.c_str(), zkLogPath.c_str());
-            if (_zk) {
-                delete _zk;
-            }
-            sleep(2);
-            return 0;
-        }
-
-        //check qconf_monitor_lock_node/default_instance/md5_list
-        //if(_zk->checkAndCreateZnode(conf->getNodeList()) == M_OK) {
-        if (_zk->createZnode2(conf->getNodeList()) == M_OK) {
-            LOG(LOG_INFO, "check znode %s done. node exist", (conf->getNodeList()).c_str());
-        }
-        else {
-            LOG(LOG_ERROR, "create znode %s failed", (conf->getNodeList()).c_str());
-            if (_zk) {
-                delete _zk;
-            }
-            sleep(2);
-            return 0;
-        }
-
-        //check qconf_monitor_lock_node/default_instance/monitor_list
-        //if(_zk->checkAndCreateZnode(conf->getMonitorList()) == M_OK) {
-        if (_zk->createZnode2(conf->getMonitorList()) == M_OK) {
-            LOG(LOG_INFO, "check znode %s done. node exist", (conf->getMonitorList()).c_str());
-        }
-        else {
-            LOG(LOG_ERROR, "create znode %s failed", (conf->getMonitorList()).c_str());
-            if (_zk) {
-                delete _zk;
-            }
-            sleep(2);
-            return 0;
-        }
-
-        // monitor register, this function should in LoadBalance
-        if (_zk->registerMonitor(conf->getMonitorList() + "/monitor_") == M_OK) {
-            LOG(LOG_INFO, "Monitor register success");
-        }
-        else {
-            LOG(LOG_ERROR, "Monitor register failed");
-            if (_zk) {
-                delete _zk;
-            }
-            sleep(2);
-            continue;
+        if (initMonitorEnv(_zk) != M_OK) {
+            delete _zk;
+            LOG(LOG_ERROR, "init monitor env failed");
+            return M_ERR;
         }
         /*
         this loop is for load balance.
         If rebalance is needed, the loop will be reiterate
         */
-        while (1) {
-            if (Process::isStop() || MultiThread::isThreadError()) {
-                break;
-            }
+        while (!Process::isStop() && !MultiThread::isThreadError()) {
             LOG(LOG_INFO, " second loop start -> !!!!!!");
-            LoadBalance::clearReBalance();
-            //load balance
-            LoadBalance* lb = LoadBalance::getInstance();
-            if (lb->initEnv() == M_OK) {
-                LOG(LOG_INFO, "init load balance env succeeded");
-            }
-            else {
-                LOG(LOG_ERROR, "init load balance env failed");
-                delete lb;
-                sleep(2);
-                continue;
-            }
 
-            if (lb->getMd5ToServiceFather() == M_OK) {
-                LOG(LOG_INFO, "get md5 to service father succeeded");
-            }
-            else {
-                LOG(LOG_ERROR, "get md5 to service father failed");
-                /*
-                how to deal with this in a better way?
-                if the reason of failure is node not exist, we should restart main loop
-                */
-                delete lb;
-                sleep(2);
-                continue;
-            }
-
-            if (lb->getMonitors() == M_OK) {
-                LOG(LOG_INFO, "get monitors secceeded");
-            }
-            else {
-                LOG(LOG_INFO, "get monitors failed");
-                delete lb;
-                sleep(2);
-                continue;
-            }
-
-            if (lb->balance() == M_OK) {
-                LOG(LOG_INFO, "balance secceeded");
-            }
-            else {
-                LOG(LOG_INFO, "balance failed");
+            LoadBalance* lb = LoadBalance::getInstance();
+            if (doLoadBalance(lb) != M_OK) {
                 delete lb;
                 sleep(2);
                 continue;
@@ -166,18 +146,12 @@ int main(int argc, char** argv){
 
             //after load balance. Each monitor should load the service to Config
             ServiceListener* sl = ServiceListener::getInstance();
-            if (sl->initEnv() == M_OK) {
-                LOG(LOG_INFO, "init service listener env succeeded");
-            }
-            else {
-                LOG(LOG_INFO, "init service listener env failed");
+            if (loadServiceToConf(sl) != M_OK) {
                 delete sl;
                 delete lb;
                 sleep(2);
                 continue;
             }
-            sl->getAllIp();
-            sl->loadAllService();
 
             //multiThread module
             MultiThread* ml = MultiThread::getInstance();
@@ -187,12 +161,7 @@ int main(int argc, char** argv){
             delete lb;
             delete sl;
             delete ml;
-            if (Process::isStop() || MultiThread::isThreadError()) {
-                break;
-            }
         }
-        delete _zk;
-        sleep(2);
     }
     LOG(LOG_ERROR, "EXIT main loop!!!");
     return 0;
diff --git a/monitor/src/monitor_config.cc b/monitor/src/monitor_config.cc
index 3ba984d..39b773e 100644
--- a/monitor/src/monitor_config.cc
+++ b/monitor/src/monitor_config.cc
@@ -1,3 +1,6 @@
+#include <unistd.h>
+#include <pthread.h>
+
 #include <fstream>
 #include <string>
 #include <unordered_map>
@@ -7,9 +10,6 @@
 #include <vector>
 #include <iostream>
 
-#include <unistd.h>
-#include <pthread.h>
-
 #include "monitor_config.h"
 #include "monitor_util.h"
 #include "monitor_log.h"
diff --git a/monitor/src/monitor_load_balance.cc b/monitor/src/monitor_load_balance.cc
index 5d117b6..04dbcfa 100644
--- a/monitor/src/monitor_load_balance.cc
+++ b/monitor/src/monitor_load_balance.cc
@@ -19,6 +19,7 @@
 #include "monitor_zk.h"
 
 using namespace std;
+
 extern char _zkLockBuf[512];
 
 bool LoadBalance::reBalance = false;
diff --git a/monitor/src/monitor_multi_thread.cc b/monitor/src/monitor_multi_thread.cc
index 5f1d2f1..7b2e256 100644
--- a/monitor/src/monitor_multi_thread.cc
+++ b/monitor/src/monitor_multi_thread.cc
@@ -119,12 +119,9 @@ bool MultiThread::isOnlyOneUp(string node, int val) {
         sl->setWatchFlag();
         sl->modifyServiceFatherStatus(serviceFather, STATUS_UP, -1);
         sl->modifyServiceFatherStatus(serviceFather, STATUS_DOWN, 1);
-        pthread_mutex_unlock(&updateServiceLock);
         ret = false;
     }
-    else {
-        pthread_mutex_unlock(&updateServiceLock);
-    }
+    pthread_mutex_unlock(&updateServiceLock);
     return ret;
 }
 
diff --git a/monitor/src/monitor_zk.cc b/monitor/src/monitor_zk.cc
index ca7d132..cfe74b4 100644
--- a/monitor/src/monitor_zk.cc
+++ b/monitor/src/monitor_zk.cc
@@ -1,13 +1,13 @@
+#include <signal.h>
+#include <sys/types.h>
+#include <errno.h>
+
 #include <map>
 #include <string>
 #include <iostream>
 #include <cstring>
 #include <cstdio>
 
-#include <signal.h>
-#include <sys/types.h>
-#include <errno.h>
-
 #include "monitor_const.h"
 #include "monitor_config.h"
 #include "monitor_util.h"
diff --git a/monitor/src/monitor_zk.h b/monitor/src/monitor_zk.h
index e8b4e53..e29dd34 100644
--- a/monitor/src/monitor_zk.h
+++ b/monitor/src/monitor_zk.h
@@ -1,13 +1,13 @@
 #ifndef ZK_H
 #define ZK_H
+#include <zookeeper.h>
+#include <zk_adaptor.h>
+
 #include <map>
 #include <cstdio>
 #include <string>
 #include <iostream>
 
-#include <zookeeper.h>
-#include <zk_adaptor.h>
-
 #include "monitor_config.h"
 #include "monitor_service_item.h"