diff --git a/src/main/java/org/bdware/server/action/p2p/AliveCheckClientAction.java b/src/main/java/org/bdware/server/action/p2p/AliveCheckClientAction.java
index aeb5adc..ab5a423 100644
--- a/src/main/java/org/bdware/server/action/p2p/AliveCheckClientAction.java
+++ b/src/main/java/org/bdware/server/action/p2p/AliveCheckClientAction.java
@@ -21,12 +21,12 @@ import java.util.Map;
 import java.util.TimerTask;
 
 public class AliveCheckClientAction {
-    private static final Logger LOGGER = LogManager.getLogger(AliveCheckClientAction.class);
-    protected boolean waitForSetNode = false;
-
     public static final int sendDelay = 2000;
     public static final int checkDelay = 5000;
+    private static final Logger LOGGER = LogManager.getLogger(AliveCheckClientAction.class);
+    private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd.HH:mm:ss");
     private final String masterPubkey;
+    protected boolean waitForSetNode = false;
     TimerTask sendPingTask;
     TimerTask checkAliveTask;
     private long lastMasterPongTime = System.currentTimeMillis();
@@ -66,7 +66,7 @@ public class AliveCheckClientAction {
                                 LOGGER.debug(
                                         String.format(
                                                 "f %s",
-                                                new SimpleDateFormat("yyyy-MM-dd.HH:mm:ss")
+                                                DATE_FORMAT
                                                         .format(System.currentTimeMillis())));
                                 Map<String, String> ping = new HashMap<>();
                                 ping.put("action", "masterPing");
@@ -93,10 +93,9 @@ public class AliveCheckClientAction {
                             long cur = System.currentTimeMillis();
                             if (cur - lastMasterPongTime >= (2 * sendDelay)) {
                                 LOGGER.info(
-                                        "lastMasterPongTime="
-                                                + new SimpleDateFormat("yyyy-MM-dd.HH:mm:ss")
-                                                .format(lastMasterPongTime)
-                                                + " 认为master崩溃!");
+                                        "master maybe crash down, because lastMasterPongTime="
+                                                + DATE_FORMAT.format(lastMasterPongTime)
+                                                + "!");
 
                                 // 向NC发通知重新选举master，如果NC没有收到所有节点的重选请求，就认为是这个节点和master连接断开
                                 // 这个节点需要重连master
@@ -107,9 +106,9 @@ public class AliveCheckClientAction {
                                 for (MultiContractMeta meta : CMActions.manager.multiContractRecorder.getStatus().values()) {
                                     if (meta.getMasterNode().equals(masterPubkey)) {
                                         LOGGER.info(
-                                                "认为合约 "
+                                                "master of contract "
                                                         + meta.getContractID()
-                                                        + " 的master崩溃  master="
+                                                        + " maybe crash down! master="
                                                         + masterPubkey);
                                         request.put("contractID", meta.getContractID());
                                         int lastSeq = meta.getLastExeSeq();
@@ -130,8 +129,7 @@ public class AliveCheckClientAction {
                     };
         lastMasterPongTime = System.currentTimeMillis();
         LOGGER.info(
-                "设置 lastMasterPongTime="
-                        + new SimpleDateFormat("yyyy-MM-dd.HH:mm:ss").format(lastMasterPongTime));
+                "lastMasterPongTime=" + DATE_FORMAT.format(lastMasterPongTime));
         HeartBeatUtil.getInstance().schedule(sendPingTask, sendDelay / 2, checkDelay);
         HeartBeatUtil.getInstance().schedule(checkAliveTask, sendDelay, checkDelay);
     }
diff --git a/src/main/java/org/bdware/server/nodecenter/client/NodeCenterClientController.java b/src/main/java/org/bdware/server/nodecenter/client/NodeCenterClientController.java
index 79a2cbf..77b0499 100644
--- a/src/main/java/org/bdware/server/nodecenter/client/NodeCenterClientController.java
+++ b/src/main/java/org/bdware/server/nodecenter/client/NodeCenterClientController.java
@@ -324,7 +324,7 @@ public class NodeCenterClientController implements NodeCenterConn {
 
     @Action(async = true)
     public void onQueryNodeAddress(JsonObject jo, ResultCallback cb) {
-        LOGGER.info("onQueryNodeAddress:" + jo.toString());
+        LOGGER.debug("onQueryNodeAddress:" + jo.toString());
         sync.wakeUp(jo.get("responseID").getAsString(), jo.toString());
     }
 
@@ -349,7 +349,8 @@ public class NodeCenterClientController implements NodeCenterConn {
         sendMsg(JsonUtil.toJson(req));
         //TODO use async instead?
         ContractResult cr = sync.syncSleep(requestID);
-        LOGGER.info("connectToNode result:" + JsonUtil.toJson(cr));
+        LOGGER.debug("result: " + JsonUtil.toJson(cr));
+        LOGGER.info("node " + pubKey + " succeed!");
         if (!cr.result.equals(JsonNull.INSTANCE)) {
             try {
                 JsonObject jo = cr.result.getAsJsonObject();
diff --git a/src/main/java/org/bdware/server/trustedmodel/AgentManager.java b/src/main/java/org/bdware/server/trustedmodel/AgentManager.java
index a03b741..5b949c5 100644
--- a/src/main/java/org/bdware/server/trustedmodel/AgentManager.java
+++ b/src/main/java/org/bdware/server/trustedmodel/AgentManager.java
@@ -70,7 +70,7 @@ public class AgentManager implements AgentPeerManagerIntf {
     @Override
     public boolean deliverEvent(String pubKey, String event) {
         if (null != pubKey && !CMActions.manager.nodeCenterConn.getNodeId().equals(pubKey)) {
-            LOGGER.info("Deliver event message in node " + pubKey.substring(0, 6));
+            LOGGER.info("Deliver event message to node " + pubKey.substring(0, 6));
             JsonObject msg = new JsonObject();
             msg.addProperty("action", "deliverEvent");
             msg.addProperty("data", event);