diff --git a/Bench4Q-Agent/src/main/java/org/bench4q/agent/plugin/basic/MongoDB/MongoDBPlugin.java b/Bench4Q-Agent/src/main/java/org/bench4q/agent/plugin/basic/MongoDB/MongoDBPlugin.java
index b7f28613..a2ef3c09 100644
--- a/Bench4Q-Agent/src/main/java/org/bench4q/agent/plugin/basic/MongoDB/MongoDBPlugin.java
+++ b/Bench4Q-Agent/src/main/java/org/bench4q/agent/plugin/basic/MongoDB/MongoDBPlugin.java
@@ -38,16 +38,15 @@ public class MongoDBPlugin {
 	@SuppressWarnings("deprecation")
 	@Behavior(value = "Insert", type = BehaviorType.USER_BEHAVIOR)
 	public MongoDBReturn insert(
-			@Parameter(value = "id", type = SupportTypes.Field) String id,
+			@Parameter(value = "key", type = SupportTypes.Field) String key,
 			@Parameter(value = "value", type = SupportTypes.Field) String value) {
-		// int recordsum = 0;
 		Mongo mongo = null;
 		try {
 			mongo = new Mongo(hostName, port);
 			DB db = mongo.getDB(dbName);
 			DBCollection table = db.getCollection(this.tableUnderTest);
 			DBObject valueToInsert = new BasicDBObject();
-			valueToInsert.put("_id", id);
+			valueToInsert.put("key", key);
 			valueToInsert.put("value", value);
 			table.save(valueToInsert);
 			return new MongoDBReturn(true);
diff --git a/Bench4Q-Agent/src/main/java/org/bench4q/agent/plugin/basic/UUID/UUID.java b/Bench4Q-Agent/src/main/java/org/bench4q/agent/plugin/basic/UUID/UUID.java
new file mode 100644
index 00000000..ce34fa2b
--- /dev/null
+++ b/Bench4Q-Agent/src/main/java/org/bench4q/agent/plugin/basic/UUID/UUID.java
@@ -0,0 +1,32 @@
+package org.bench4q.agent.plugin.basic.UUID;
+
+import org.bench4q.agent.plugin.Constructor;
+import org.bench4q.agent.plugin.Parameter;
+import org.bench4q.agent.plugin.ParameterBarn;
+import org.bench4q.agent.plugin.Plugin;
+import org.bench4q.agent.plugin.behavior.Behavior;
+import org.bench4q.agent.plugin.behavior.BehaviorType;
+import org.bench4q.agent.utils.Type.SupportTypes;
+
+@Plugin("UUID")
+public class UUID extends ParameterBarn {
+	private java.util.UUID uuid;
+
+	@Constructor
+	public UUID(
+			@Parameter(value = "testId", type = SupportTypes.Field) String testId) {
+		super(testId);
+		uuid = java.util.UUID.randomUUID();
+	}
+
+	@Behavior(value = "Next", type = BehaviorType.CONTROL_BEHAVIOR)
+	public void next() {
+		this.uuid = java.util.UUID.randomUUID();
+	}
+
+	@Override
+	public String getValue(String var) {
+		return this.uuid.toString();
+	}
+
+}
diff --git a/Bench4Q-Agent/src/main/java/org/bench4q/agent/plugin/basic/UUID/ui.xml b/Bench4Q-Agent/src/main/java/org/bench4q/agent/plugin/basic/UUID/ui.xml
new file mode 100644
index 00000000..cec3acf4
--- /dev/null
+++ b/Bench4Q-Agent/src/main/java/org/bench4q/agent/plugin/basic/UUID/ui.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE ui SYSTEM "../../dtd/ui.dtd">
+<ui>
+	<plugin name="UUID">
+		<params>
+		</params>
+	</plugin>
+	<control name="next">
+		<params />
+	</control>
+</ui>
\ No newline at end of file
diff --git a/Bench4Q-Agent/src/test/java/org/bench4q/agent/test/plugin/Test_MongoDBPlugin.java b/Bench4Q-Agent/src/test/java/org/bench4q/agent/test/plugin/Test_MongoDBPlugin.java
index aaf3fa3f..81ab2682 100644
--- a/Bench4Q-Agent/src/test/java/org/bench4q/agent/test/plugin/Test_MongoDBPlugin.java
+++ b/Bench4Q-Agent/src/test/java/org/bench4q/agent/test/plugin/Test_MongoDBPlugin.java
@@ -34,22 +34,13 @@ public class Test_MongoDBPlugin extends TestBase {
 
 	@Test
 	public void test_Insert() {
-		MongoDBPlugin mongoDBPlugin = new MongoDBPlugin("localhost", 27017,
-				"temp");
-		MongoDBReturn result = mongoDBPlugin.insert(this.testId.toString(),
-				"value1");
-		result = mongoDBPlugin.query("propertyName=_id|propertyValue="
-				+ this.testId.toString() + "|;");
-		assertTrue(result.getSuccessCount() > 0);
-	}
-
-	@Test
-	public void test_query() {
 		MongoDBPlugin mongoDBPlugin = new MongoDBPlugin("localhost", 27017,
 				"temp");
 		MongoDBReturn result = mongoDBPlugin
-				.query("propertyName=_id|propertyValue="
-						+ this.testId.toString() + "|;");
+				.insert(this.testId.toString(),
+						"value1AAAAAAAAAAAAAAAAAAAAAAASFFFAFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF");
+		result = mongoDBPlugin.query("propertyName=key|propertyValue="
+				+ this.testId.toString() + "|;");
 		assertTrue(result.getSuccessCount() > 0);
 	}
 
@@ -72,16 +63,23 @@ public class Test_MongoDBPlugin extends TestBase {
 		page1.getBatches().add(batch);
 		scenarioModel.getPages().add(page1);
 
-		batch.getBehaviors().add(
-				BehaviorModel.UserBehaviorBuilder(0, "Insert", pluginId, Arrays
-						.asList(ParameterModel.createParameter("id",
-								this.testId.toString()), ParameterModel
-								.createParameter("value", "value2"))));
+		batch.getBehaviors()
+				.add(BehaviorModel.UserBehaviorBuilder(
+						0,
+						"Insert",
+						pluginId,
+						Arrays.asList(
+								ParameterModel.createParameter("key",
+										this.testId.toString()),
+								ParameterModel
+										.createParameter(
+												"value",
+												"ZXZXCZXVZXZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ"))));
 		batch.getBehaviors().add(
 				BehaviorModel.UserBehaviorBuilder(1, "Query", pluginId, Arrays
 						.asList(ParameterModel.createParameter(
 								"properties",
-								"propertyName=_id|propertyValue="
+								"propertyName=key|propertyValue="
 										+ this.testId.toString() + "|;"))));
 		String scriptContent = MarshalHelper.tryMarshal(scenarioModel);
 		System.out.println(scriptContent);