diff --git a/src/main/java/com/alibaba/druid/pool/DruidAbstractDataSource.java b/src/main/java/com/alibaba/druid/pool/DruidAbstractDataSource.java
index f5b5ef40c6..ce777a17a4 100644
--- a/src/main/java/com/alibaba/druid/pool/DruidAbstractDataSource.java
+++ b/src/main/java/com/alibaba/druid/pool/DruidAbstractDataSource.java
@@ -790,6 +790,10 @@ public void setKeepAliveBetweenTimeMillis(long keepAliveBetweenTimeMillis) {
             LOG.error("keepAliveBetweenTimeMillis should be greater than 30000");
         }
 
+        if (keepAliveBetweenTimeMillis <= timeBetweenEvictionRunsMillis) {
+            LOG.warn("keepAliveBetweenTimeMillis should be greater than timeBetweenEvictionRunsMillis");
+        }
+
         this.keepAliveBetweenTimeMillis = keepAliveBetweenTimeMillis;
     }
 
diff --git a/src/main/java/com/alibaba/druid/pool/DruidDataSource.java b/src/main/java/com/alibaba/druid/pool/DruidDataSource.java
index ee966d5fdd..807893893a 100644
--- a/src/main/java/com/alibaba/druid/pool/DruidDataSource.java
+++ b/src/main/java/com/alibaba/druid/pool/DruidDataSource.java
@@ -870,6 +870,10 @@ public void init() throws SQLException {
                 throw new SQLException("maxEvictableIdleTimeMillis must be grater than minEvictableIdleTimeMillis");
             }
 
+            if (keepAlive && keepAliveBetweenTimeMillis <= timeBetweenEvictionRunsMillis) {
+                throw new SQLException("keepAliveBetweenTimeMillis must be grater than timeBetweenEvictionRunsMillis");
+            }
+
             if (this.driverClass != null) {
                 this.driverClass = driverClass.trim();
             }
@@ -2864,7 +2868,7 @@ public void run() {
             for (;;) {
                 // 从前面开始删除
                 try {
-                    if (closed) {
+                    if (closed || closing) {
                         break;
                     }
 
diff --git a/src/main/java/com/alibaba/druid/pool/DruidDataSourceC3P0Adapter.java b/src/main/java/com/alibaba/druid/pool/DruidDataSourceC3P0Adapter.java
index e97482328f..6874e99031 100644
--- a/src/main/java/com/alibaba/druid/pool/DruidDataSourceC3P0Adapter.java
+++ b/src/main/java/com/alibaba/druid/pool/DruidDataSourceC3P0Adapter.java
@@ -165,7 +165,9 @@ public int getIdleConnectionTestPeriod() {
     }
 
     public void setIdleConnectionTestPeriod(int idleConnectionTestPeriod) {
-        dataSource.setTimeBetweenEvictionRunsMillis(((long) idleConnectionTestPeriod) * 1000L);
+        long timeBetweenEvictionRunsMillis = ((long) idleConnectionTestPeriod) * 1000L;
+        dataSource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
+        dataSource.setKeepAliveBetweenTimeMillis(timeBetweenEvictionRunsMillis * 2);
     }
 
     public int getInitialPoolSize() {
diff --git a/src/test/java/com/alibaba/druid/bvt/pool/KeepAliveTest.java b/src/test/java/com/alibaba/druid/bvt/pool/KeepAliveTest.java
index 32c262d4cc..bbb431040c 100644
--- a/src/test/java/com/alibaba/druid/bvt/pool/KeepAliveTest.java
+++ b/src/test/java/com/alibaba/druid/bvt/pool/KeepAliveTest.java
@@ -37,9 +37,12 @@ protected void tearDown() throws Exception {
     public void test_keepAlive() throws Exception {
         dataSource.init();
 
-        for (int i = 0; i < 1000; ++i) {
-            if (dataSource.getMinIdle() == dataSource.getPoolingCount()) {
+        for (int i = 0; i < 100; ++i) {
+            int poolingCount = dataSource.getPoolingCount();
+            if (poolingCount >= dataSource.getMinIdle()) {
                 break;
+            } else {
+                System.out.println("poolingCount : " + poolingCount);
             }
             Thread.sleep(10 * 1);
         }
@@ -55,8 +58,5 @@ public void test_keepAlive() throws Exception {
         }
         // assertEquals(dataSource.getMaxActive(), dataSource.getPoolingCount());
 
-
-
-        Thread.sleep(1000 * 1000);
     }
 }