diff --git a/skywalking-api/src/main/java/com/ai/cloud/skywalking/conf/Config.java b/skywalking-api/src/main/java/com/ai/cloud/skywalking/conf/Config.java
index fdb335e46d..f1b800fcc5 100644
--- a/skywalking-api/src/main/java/com/ai/cloud/skywalking/conf/Config.java
+++ b/skywalking-api/src/main/java/com/ai/cloud/skywalking/conf/Config.java
@@ -28,7 +28,7 @@ public class Config {
         public static int BUFFER_MAX_SIZE = 18000;
 
         // Buffer池的最大长度
-        public static int POOL_MAX_LENGTH = 5;
+        public static int POOL_SIZE = 5;
     }
 
     public static class Sender {
@@ -59,4 +59,8 @@ public class Config {
     }
 
 
+    public static class BusinessKey {
+        //Business Key 最大长度
+        public static int MAX_LENGTH = 300;
+    }
 }
\ No newline at end of file
diff --git a/skywalking-api/src/main/java/com/ai/cloud/skywalking/util/BusinessKeyTracing.java b/skywalking-api/src/main/java/com/ai/cloud/skywalking/util/BusinessKeyTracing.java
index 58b334b952..7caf3a6c4a 100644
--- a/skywalking-api/src/main/java/com/ai/cloud/skywalking/util/BusinessKeyTracing.java
+++ b/skywalking-api/src/main/java/com/ai/cloud/skywalking/util/BusinessKeyTracing.java
@@ -1,11 +1,13 @@
 package com.ai.cloud.skywalking.util;
 
+import com.ai.cloud.skywalking.conf.AuthDesc;
+import com.ai.cloud.skywalking.conf.Config;
 import com.ai.cloud.skywalking.context.Context;
 import com.ai.cloud.skywalking.context.Span;
 
 public final class BusinessKeyTracing {
 
-    private static final char spiltChar='^';
+    private static final char spiltChar = '^';
 
 
     private BusinessKeyTracing() {
@@ -13,8 +15,14 @@ public final class BusinessKeyTracing {
     }
 
     public static void trace(String businessKey) {
-        //
+
+        if (!AuthDesc.isAuth())
+            return;
+
         Span spanData = Context.getLastSpan();
-        spanData.setBusinessKey(businessKey.replace('-',spiltChar));
+        if (spanData != null) {
+            return;
+        }
+        spanData.setBusinessKey(businessKey.replace('-', spiltChar).substring(0, Config.BusinessKey.MAX_LENGTH));
     }
 }