diff --git a/src/org/redkale/source/DataJdbcSource.java b/src/org/redkale/source/DataJdbcSource.java
index 827923c67..a523294f8 100644
--- a/src/org/redkale/source/DataJdbcSource.java
+++ b/src/org/redkale/source/DataJdbcSource.java
@@ -45,8 +45,8 @@ public class DataJdbcSource extends DataSqlSource<Connection> {
     }
 
     @Override
-    protected PoolSource<Connection> createPoolSource(DataSource source, String rwtype, ArrayBlockingQueue queue, Properties prop) {
-        return new PoolJdbcSource(this.name, this.persistxml, rwtype, queue, prop, this.logger);
+    protected PoolSource<Connection> createPoolSource(DataSource source, String rwtype, ArrayBlockingQueue queue, Semaphore semaphore, Properties prop) {
+        return new PoolJdbcSource(this.name, this.persistxml, rwtype, queue, semaphore, prop, this.logger);
     }
 
     @Override
diff --git a/src/org/redkale/source/DataMemorySource.java b/src/org/redkale/source/DataMemorySource.java
index 9e24f95c3..6b365a73c 100644
--- a/src/org/redkale/source/DataMemorySource.java
+++ b/src/org/redkale/source/DataMemorySource.java
@@ -79,7 +79,7 @@ public class DataMemorySource extends DataSqlSource<Void> {
     }
 
     @Override
-    protected PoolSource<Void> createPoolSource(DataSource source, String rwtype, ArrayBlockingQueue queue, Properties prop) {
+    protected PoolSource<Void> createPoolSource(DataSource source, String rwtype, ArrayBlockingQueue queue, Semaphore semaphore, Properties prop) {
         return null;
     }
 
diff --git a/src/org/redkale/source/DataSqlSource.java b/src/org/redkale/source/DataSqlSource.java
index 80cce0e66..4ff914d7c 100644
--- a/src/org/redkale/source/DataSqlSource.java
+++ b/src/org/redkale/source/DataSqlSource.java
@@ -104,8 +104,9 @@ public abstract class DataSqlSource<DBChannel> extends AbstractService implement
         this.persistxml = persistxml;
         this.cacheForbidden = "NONE".equalsIgnoreCase(readprop.getProperty(JDBC_CACHE_MODE));
         ArrayBlockingQueue<DBChannel> queue = maxconns > 0 ? new ArrayBlockingQueue(maxconns) : null;
-        this.readPool = createPoolSource(this, "read", queue, readprop);
-        this.writePool = createPoolSource(this, "write", queue, writeprop);
+        Semaphore semaphore = maxconns > 0 ? new Semaphore(maxconns) : null;
+        this.readPool = createPoolSource(this, "read", queue, semaphore, readprop);
+        this.writePool = createPoolSource(this, "write", queue, semaphore, writeprop);
     }
 
     @Local
@@ -124,7 +125,7 @@ public abstract class DataSqlSource<DBChannel> extends AbstractService implement
     protected abstract String prepareParamSign(int index);
 
     //创建连接池
-    protected abstract PoolSource<DBChannel> createPoolSource(DataSource source, String rwtype, ArrayBlockingQueue queue, Properties prop);
+    protected abstract PoolSource<DBChannel> createPoolSource(DataSource source, String rwtype, ArrayBlockingQueue queue, Semaphore semaphore, Properties prop);
 
     //插入纪录
     protected abstract <T> CompletableFuture<Integer> insertDB(final EntityInfo<T> info, T... values);
diff --git a/src/org/redkale/source/PoolJdbcSource.java b/src/org/redkale/source/PoolJdbcSource.java
index 750990373..c20afebb6 100644
--- a/src/org/redkale/source/PoolJdbcSource.java
+++ b/src/org/redkale/source/PoolJdbcSource.java
@@ -33,8 +33,8 @@ public class PoolJdbcSource extends PoolSource<Connection> {
 
     protected final URL persistxml;
 
-    public PoolJdbcSource(String unitName, URL persistxml, String rwtype, ArrayBlockingQueue aqueue, Properties prop, Logger logger) {
-        super(rwtype, prop, logger);
+    public PoolJdbcSource(String unitName, URL persistxml, String rwtype, ArrayBlockingQueue aqueue, Semaphore semaphore, Properties prop, Logger logger) {
+        super(rwtype, semaphore, prop, logger);
         this.unitName = unitName;
         this.persistxml = persistxml;
         this.source = createDataSource(prop);
diff --git a/src/org/redkale/source/PoolSource.java b/src/org/redkale/source/PoolSource.java
index 25c1d9d30..70feffb1d 100644
--- a/src/org/redkale/source/PoolSource.java
+++ b/src/org/redkale/source/PoolSource.java
@@ -23,6 +23,8 @@ import static org.redkale.source.DataSources.*;
  */
 public abstract class PoolSource<DBChannel> {
 
+    protected final AtomicLong closeCounter = new AtomicLong();
+
     protected final AtomicLong usingCounter = new AtomicLong();
 
     protected final AtomicLong creatCounter = new AtomicLong();
@@ -64,7 +66,7 @@ public abstract class PoolSource<DBChannel> {
     protected Properties attributes = new Properties();
 
     @SuppressWarnings("OverridableMethodCallInConstructor")
-    public PoolSource(String rwtype, Properties prop, Logger logger) {
+    public PoolSource(String rwtype, Semaphore semaphore, Properties prop, Logger logger) {
         this.logger = logger;
         this.rwtype = rwtype;
         this.props = prop;
@@ -76,7 +78,7 @@ public abstract class PoolSource<DBChannel> {
         this.readTimeoutSeconds = Integer.decode(prop.getProperty(JDBC_READTIMEOUT_SECONDS, "3"));
         this.writeTimeoutSeconds = Integer.decode(prop.getProperty(JDBC_WRITETIMEOUT_SECONDS, "3"));
         this.maxconns = Math.max(8, Integer.decode(prop.getProperty(JDBC_CONNECTIONS_LIMIT, "" + Runtime.getRuntime().availableProcessors() * 100)));
-        this.semaphore = new Semaphore(this.maxconns);
+        this.semaphore = semaphore == null ? new Semaphore(this.maxconns) : semaphore;
         String dbtype0 = "";
         { //jdbc:mysql:// jdbc:microsoft:sqlserver:// 取://之前的到最后一个:之间的字符串
             int pos = this.url.indexOf("://");
@@ -161,6 +163,10 @@ public abstract class PoolSource<DBChannel> {
         return dbtype;
     }
 
+    public final long getCloseCount() {
+        return closeCounter.longValue();
+    }
+
     public final long getUsingCount() {
         return usingCounter.longValue();
     }
diff --git a/src/org/redkale/source/PoolTcpSource.java b/src/org/redkale/source/PoolTcpSource.java
index dc71d21f5..c3850b3fd 100644
--- a/src/org/redkale/source/PoolTcpSource.java
+++ b/src/org/redkale/source/PoolTcpSource.java
@@ -40,8 +40,8 @@ public abstract class PoolTcpSource extends PoolSource<AsyncConnection> {
 
     protected final ArrayBlockingQueue<AsyncConnection> connQueue;
 
-    public PoolTcpSource(String rwtype, ArrayBlockingQueue queue, Properties prop, Logger logger, ObjectPool<ByteBuffer> bufferPool, ThreadPoolExecutor executor) {
-        super(rwtype, prop, logger);
+    public PoolTcpSource(String rwtype, ArrayBlockingQueue queue, Semaphore semaphore, Properties prop, Logger logger, ObjectPool<ByteBuffer> bufferPool, ThreadPoolExecutor executor) {
+        super(rwtype, semaphore, prop, logger);
         this.bufferPool = bufferPool;
         this.executor = executor;
         try {
@@ -55,7 +55,7 @@ public abstract class PoolTcpSource extends PoolSource<AsyncConnection> {
     @Override
     public void offerConnection(final AsyncConnection conn) {
         if (conn == null) return;
-        if (connQueue.offer(conn)) {
+        if (conn.isOpen() && connQueue.offer(conn)) {
             saveCounter.incrementAndGet();
             usingCounter.decrementAndGet();
         } else {
@@ -136,6 +136,7 @@ public abstract class PoolTcpSource extends PoolSource<AsyncConnection> {
         return AsyncConnection.createTCP(group, this.servaddr, this.readTimeoutSeconds, this.writeTimeoutSeconds).thenCompose(conn -> {
             conn.beforeCloseListener((c) -> {
                 semaphore.release();
+                closeCounter.incrementAndGet();
                 usingCounter.decrementAndGet();
             });
             CompletableFuture<AsyncConnection> future = new CompletableFuture();