diff --git a/C#/source/Yitter.IdGenerator/Core/SnowWorkerM1.cs b/C#/source/Yitter.IdGenerator/Core/SnowWorkerM1.cs
index 32750470077a7ec5eee37fdfb10a3a1ef205e509..3a6d6f53adc8ba052c28c41a066e8cd84d8773c1 100644
--- a/C#/source/Yitter.IdGenerator/Core/SnowWorkerM1.cs
+++ b/C#/source/Yitter.IdGenerator/Core/SnowWorkerM1.cs
@@ -100,7 +100,7 @@ namespace Yitter.IdGenerator
 
             if (MaxSeqNumber == 0)
             {
-                MaxSeqNumber = (int)Math.Pow(2, SeqBitLength);
+                MaxSeqNumber = (int)Math.Pow(2, SeqBitLength)-1;
             }
 
             _TimestampShift = (byte)(WorkerIdBitLength + SeqBitLength);
diff --git a/C#/source/Yitter.IdGenerator/DefaultIdGenerator.cs b/C#/source/Yitter.IdGenerator/DefaultIdGenerator.cs
index 01a6acfd0a6c84de1dfcdf9808c91ccbebe18002..6b9ece593e49f09b6eb541300e27e59cdaf45eb1 100644
--- a/C#/source/Yitter.IdGenerator/DefaultIdGenerator.cs
+++ b/C#/source/Yitter.IdGenerator/DefaultIdGenerator.cs
@@ -57,11 +57,10 @@ namespace Yitter.IdGenerator
             }
 
             var maxSeqNumber = Math.Pow(2, options.SeqBitLength) - 1;
-            if (options.MaxSeqNumber > maxSeqNumber)
-            {
-                options.MaxSeqNumber = (int)maxSeqNumber;
-            }
-
+            //if (options.MaxSeqNumber > maxSeqNumber)
+            //{
+            //    options.MaxSeqNumber = (int)maxSeqNumber;
+            //}
             if (options.MaxSeqNumber < 0 || options.MaxSeqNumber > maxSeqNumber)
             {
                 throw new ApplicationException("MaxSeqNumber error. (range:[1, " + maxSeqNumber + "]");
diff --git a/Java/source/src/main/java/com/yitter/contract/IdGeneratorOptions.java b/Java/source/src/main/java/com/yitter/contract/IdGeneratorOptions.java
index 7984b7a3982b19489017dd0c391bb9e336f58c5f..0980cd4b7b64bcfc6fe48edad53a14d1c118e59f 100644
--- a/Java/source/src/main/java/com/yitter/contract/IdGeneratorOptions.java
+++ b/Java/source/src/main/java/com/yitter/contract/IdGeneratorOptions.java
@@ -50,9 +50,9 @@ public class IdGeneratorOptions {
 
     /**
      * 最小序列数（含）
-     * 默认11，不小于5，不大于MaxSeqNumber-2
+     * 默认5，不小于1，不大于MaxSeqNumber-1
      */
-    public short MinSeqNumber = 11;
+    public short MinSeqNumber = 5;
 
     /**
      * 最大漂移次数（含）