diff --git a/Java/source/src/main/java/com/yitter/idgen/DefaultIdGenerator.java b/Java/source/src/main/java/com/yitter/idgen/DefaultIdGenerator.java
index ab4e541..a97e349 100644
--- a/Java/source/src/main/java/com/yitter/idgen/DefaultIdGenerator.java
+++ b/Java/source/src/main/java/com/yitter/idgen/DefaultIdGenerator.java
@@ -25,15 +25,13 @@ public class DefaultIdGenerator implements IIdGenerator {
             throw new IdGeneratorException("BaseTime error.");
         }
 
+        if (options.WorkerIdBitLength <= 0) {
+            throw new IdGeneratorException("WorkerIdBitLength error.(range:[1, 21])");
+        }
         if (options.SeqBitLength + options.WorkerIdBitLength > 22) {
             throw new IdGeneratorException("error：WorkerIdBitLength + SeqBitLength <= 22");
         }
 
-        if (options.WorkerIdBitLength <= 0)
-        {
-            throw new IdGeneratorException("WorkerIdBitLength error.(range:[1, 21])");
-        }
-
         double maxWorkerIdNumber = Math.pow(2, options.WorkerIdBitLength) - 1;
         if (options.WorkerId < 0 || options.WorkerId > maxWorkerIdNumber) {
             throw new IdGeneratorException("WorkerId error. (range:[0, " + (maxWorkerIdNumber > 0 ? maxWorkerIdNumber : 63) + "]");