diff --git a/fastdfs-client.properties b/fastdfs-client.properties
index 54e30eb..aa82076 100644
--- a/fastdfs-client.properties
+++ b/fastdfs-client.properties
@@ -12,12 +12,13 @@ fastdfs.http_tracker_http_port = 80
 fastdfs.tracker_servers = 10.0.11.201:22122,10.0.11.202:22122,10.0.11.203:22122
 
 ## Whether to open the connection pool, if not, create a new connection every time
-fastdfs.connection_pool.enabled = false
+fastdfs.connection_pool.enabled = true
 
-## max_count_per_entry: max connection count per host:port , 0 is not limit
-fastdfs.connection_pool.max_count_per_entry = 100
+## max_count_per_entry: max connection count per host:port, 0 is not limit
+fastdfs.connection_pool.max_count_per_entry = 500
 
-## connections whose the idle time exceeds this time will be closed, unit: second,default value is 60
-fastdfs.connection_pool.max_idle_time = 60
-## Maximum waiting time when the maximum number of connections is reached, unit: Millisecond, default value is 5000
-fastdfs.connection_pool.max_wait_time_in_ms = 5000
+## connections whose the idle time exceeds this time will be closed, unit: second, default value is 3600
+fastdfs.connection_pool.max_idle_time = 3600
+
+## Maximum waiting time when the maximum number of connections is reached, unit: millisecond, default value is 1000
+fastdfs.connection_pool.max_wait_time_in_ms = 1000
diff --git a/fdfs_client.conf b/fdfs_client.conf
index 7d56fce..918f233 100644
--- a/fdfs_client.conf
+++ b/fdfs_client.conf
@@ -9,7 +9,7 @@ tracker_server = 10.0.11.247:22122
 tracker_server = 10.0.11.248:22122
 tracker_server = 10.0.11.249:22122
 
-connection_pool.enabled = false
-connection_pool.max_count_per_entry = 100
-connection_pool.max_idle_time = 60
-connection_pool.max_wait_time_in_ms = 5000
+connection_pool.enabled = true
+connection_pool.max_count_per_entry = 500
+connection_pool.max_idle_time = 3600
+connection_pool.max_wait_time_in_ms = 1000
diff --git a/src/main/java/org/csource/fastdfs/ClientGlobal.java b/src/main/java/org/csource/fastdfs/ClientGlobal.java
index d364ac9..2099b3c 100644
--- a/src/main/java/org/csource/fastdfs/ClientGlobal.java
+++ b/src/main/java/org/csource/fastdfs/ClientGlobal.java
@@ -58,8 +58,8 @@ public class ClientGlobal {
 
   public static final boolean DEFAULT_CONNECTION_POOL_ENABLED = false;
   public static final int DEFAULT_CONNECTION_POOL_MAX_COUNT_PER_ENTRY = 100;
-  public static final int DEFAULT_CONNECTION_POOL_MAX_IDLE_TIME = 60 ;//second
-  public static final int DEFAULT_CONNECTION_POOL_MAX_WAIT_TIME_IN_MS = 5000 ;//millisecond
+  public static final int DEFAULT_CONNECTION_POOL_MAX_IDLE_TIME = 3600 ;//second
+  public static final int DEFAULT_CONNECTION_POOL_MAX_WAIT_TIME_IN_MS = 1000 ;//millisecond
 
   public static int g_connect_timeout = DEFAULT_CONNECT_TIMEOUT * 1000; //millisecond
   public static int g_network_timeout = DEFAULT_NETWORK_TIMEOUT * 1000; //millisecond
diff --git a/src/main/java/org/csource/fastdfs/pool/ConnectionFactory.java b/src/main/java/org/csource/fastdfs/pool/ConnectionFactory.java
index a7d0738..0a6b663 100644
--- a/src/main/java/org/csource/fastdfs/pool/ConnectionFactory.java
+++ b/src/main/java/org/csource/fastdfs/pool/ConnectionFactory.java
@@ -23,7 +23,7 @@ public class ConnectionFactory {
             sock.connect(socketAddress, ClientGlobal.g_connect_timeout);
             return new Connection(sock, socketAddress);
         } catch (Exception e) {
-            throw new MyException("connect to server, " + socketAddress.getAddress().getHostAddress() + ":" + socketAddress.getPort() + " fail, emsg:" + e.getMessage());
+            throw new MyException("connect to server " + socketAddress.getAddress().getHostAddress() + ":" + socketAddress.getPort() + " fail, emsg:" + e.getMessage());
         }
     }
 }
diff --git a/src/main/java/org/csource/fastdfs/pool/ConnectionManager.java b/src/main/java/org/csource/fastdfs/pool/ConnectionManager.java
index 69fe51e..548d2ee 100644
--- a/src/main/java/org/csource/fastdfs/pool/ConnectionManager.java
+++ b/src/main/java/org/csource/fastdfs/pool/ConnectionManager.java
@@ -35,7 +35,7 @@ public class ConnectionManager {
     /**
      * free connections
      */
-    private  LinkedList<Connection> freeConnections = new LinkedList<Connection>();
+    private LinkedList<Connection> freeConnections = new LinkedList<Connection>();
 
     private ConnectionManager() {