diff --git a/motan-core/src/main/java/com/weibo/api/motan/transport/AbstractSharedPoolClient.java b/motan-core/src/main/java/com/weibo/api/motan/transport/AbstractSharedPoolClient.java
index 65ee6ede4..7906a3c98 100644
--- a/motan-core/src/main/java/com/weibo/api/motan/transport/AbstractSharedPoolClient.java
+++ b/motan-core/src/main/java/com/weibo/api/motan/transport/AbstractSharedPoolClient.java
@@ -84,7 +84,7 @@ private void createConnections() {
     }
 
     protected Channel getChannel() throws MotanServiceException {
-        int index = MathUtil.getNonNegative(idx.getAndIncrement());
+        int index = MathUtil.getNonNegativeRange24bit(idx.getAndIncrement());
         Channel channel;
 
         for (int i = index; i < connections + index; i++) {
diff --git a/motan-core/src/main/java/com/weibo/api/motan/util/MathUtil.java b/motan-core/src/main/java/com/weibo/api/motan/util/MathUtil.java
index 2b118f2bd..2549f2fa4 100644
--- a/motan-core/src/main/java/com/weibo/api/motan/util/MathUtil.java
+++ b/motan-core/src/main/java/com/weibo/api/motan/util/MathUtil.java
@@ -66,4 +66,15 @@ public static long parseLong(String longStr, long defaultValue){
     public static int getNonNegative(int originValue){
         return 0x7fffffff & originValue;
     }
+
+    /**
+     * 通过二进制位操作将originValue转化为非负数:
+     * 范围在[0-16777215] 之间
+     *
+     * @param originValue
+     * @return
+     */
+    public static int getNonNegativeRange24bit(int originValue) {
+        return 0x00ffffff & originValue;
+    }
 }