diff --git a/did-server/src/main/java/cn/ceres/did/core/SnowFlake.java b/did-server/src/main/java/cn/ceres/did/core/SnowFlake.java
index 9efbf5c..df4155d 100644
--- a/did-server/src/main/java/cn/ceres/did/core/SnowFlake.java
+++ b/did-server/src/main/java/cn/ceres/did/core/SnowFlake.java
@@ -70,10 +70,10 @@ public class SnowFlake {
      */
     public SnowFlake(long datacenterId, long machineId) {
         if (datacenterId > MAX_DATACENTER_NUM || datacenterId < 0) {
-            throw new IllegalArgumentException("datacenterId can't be greater than MAX_DATACENTER_NUM or less than 0");
+            throw new IllegalArgumentException("datacenterId can't be greater than " + MAX_DATACENTER_NUM + " or less than 0");
         }
         if (machineId > MAX_MACHINE_NUM || machineId < 0) {
-            throw new IllegalArgumentException("machineId can't be greater than MAX_MACHINE_NUM or less than 0");
+            throw new IllegalArgumentException("machineId can't be greater than " + MAX_MACHINE_NUM + " or less than 0");
         }
         this.datacenterId = datacenterId;
         this.machineId = machineId;