diff --git a/apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/logging/core/LogLevel.java b/apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/logging/core/LogLevel.java
index a6aa5d097..dbc45c839 100644
--- a/apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/logging/core/LogLevel.java
+++ b/apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/logging/core/LogLevel.java
@@ -22,5 +22,5 @@ package org.skywalking.apm.agent.core.logging.core;
  * Created by xin on 2016/12/7.
  */
 public enum LogLevel {
-    DEBUG, INFO, WARN, ERROR;
+    DEBUG, INFO, WARN, ERROR, OFF
 }
diff --git a/apm-sniffer/apm-test-tools/src/main/java/org/skywalking/apm/agent/test/tools/AgentServiceRule.java b/apm-sniffer/apm-test-tools/src/main/java/org/skywalking/apm/agent/test/tools/AgentServiceRule.java
index ebaad9f9d..ebcfddd77 100644
--- a/apm-sniffer/apm-test-tools/src/main/java/org/skywalking/apm/agent/test/tools/AgentServiceRule.java
+++ b/apm-sniffer/apm-test-tools/src/main/java/org/skywalking/apm/agent/test/tools/AgentServiceRule.java
@@ -23,10 +23,12 @@ import java.util.LinkedList;
 import org.junit.rules.ExternalResource;
 import org.skywalking.apm.agent.core.boot.BootService;
 import org.skywalking.apm.agent.core.boot.ServiceManager;
+import org.skywalking.apm.agent.core.conf.Config;
 import org.skywalking.apm.agent.core.conf.RemoteDownstreamConfig;
 import org.skywalking.apm.agent.core.context.IgnoredTracerContext;
 import org.skywalking.apm.agent.core.context.TracingContext;
 import org.skywalking.apm.agent.core.context.TracingContextListener;
+import org.skywalking.apm.agent.core.logging.core.LogLevel;
 import org.skywalking.apm.agent.test.helper.FieldSetter;
 
 public class AgentServiceRule extends ExternalResource {
@@ -38,6 +40,7 @@ public class AgentServiceRule extends ExternalResource {
             FieldSetter.setValue(ServiceManager.INSTANCE.getClass(), "bootedServices", new HashMap<Class, BootService>());
             FieldSetter.setValue(IgnoredTracerContext.ListenerManager.class, "LISTENERS", new LinkedList<TracingContextListener>());
             FieldSetter.setValue(TracingContext.ListenerManager.class, "LISTENERS", new LinkedList<TracingContextListener>());
+            ServiceManager.INSTANCE.shutdown();
         } catch (Exception e) {
         }
     }
@@ -45,6 +48,7 @@ public class AgentServiceRule extends ExternalResource {
     @Override
     protected void before() throws Throwable {
         super.before();
+        Config.Logging.LEVEL = LogLevel.OFF;
         ServiceManager.INSTANCE.boot();
         RemoteDownstreamConfig.Agent.APPLICATION_ID = 1;
         RemoteDownstreamConfig.Agent.APPLICATION_INSTANCE_ID = 1;