diff --git a/src/main/java/com/xuxd/kafka/console/service/impl/OperationServiceImpl.java b/src/main/java/com/xuxd/kafka/console/service/impl/OperationServiceImpl.java
index c935dd5..53b5afe 100644
--- a/src/main/java/com/xuxd/kafka/console/service/impl/OperationServiceImpl.java
+++ b/src/main/java/com/xuxd/kafka/console/service/impl/OperationServiceImpl.java
@@ -64,12 +64,12 @@ public class OperationServiceImpl implements OperationService {
 
     @Override public ResponseData minOffsetAlignment(String groupId, String topic, Properties thatProps) {
 
-        Tuple2<Map<TopicPartition, Object>, Map<TopicPartition, Object>> tuple2 = operationConsole.checkAndFetchMinOffset(groupId, topic, thatProps);
-        Map<TopicPartition, Object> thisMinOffset = tuple2._1();
+        Tuple2<Map<TopicPartition, Object>, Map<TopicPartition, Object>> tuple2 = operationConsole.checkAndFetchOffset(groupId, topic, thatProps);
+        Map<TopicPartition, Object> thisMaxOffset = tuple2._1();
         Map<TopicPartition, Object> thatMinOffset = tuple2._2();
 
         JsonObject thisJson = new JsonObject(), thatJson = new JsonObject();
-        thisMinOffset.forEach((k, v) -> {
+        thisMaxOffset.forEach((k, v) -> {
             thisJson.addProperty(String.valueOf(k.partition()), v.toString());
         });
         thatMinOffset.forEach((k, v) -> {
diff --git a/src/main/scala/kafka/console/OperationConsole.scala b/src/main/scala/kafka/console/OperationConsole.scala
index dd5e6ef..d48afc3 100644
--- a/src/main/scala/kafka/console/OperationConsole.scala
+++ b/src/main/scala/kafka/console/OperationConsole.scala
@@ -96,7 +96,7 @@ class OperationConsole(config: KafkaConfig, topicConsole: TopicConsole,
     import java.util
 
     def syncConsumerOffset(groupId: String, topic: String, props: Properties,
-        thisMinOffset: util.Map[TopicPartition, Long],
+        thisMaxOffset: util.Map[TopicPartition, Long],
         thatMinOffset: util.Map[TopicPartition, Long]): (Boolean, String) = {
         val thatAdmin = createAdminClient(props)
         try {
@@ -143,9 +143,9 @@ class OperationConsole(config: KafkaConfig, topicConsole: TopicConsole,
                 }
             })
             // get from this kafka: min offset of topic
-            val thisMinTopicOffset = thisMinOffset.asScala
+            val thisMaxTopicOffset = thisMaxOffset.asScala
 
-            for ((t: TopicPartition, o: Long) <- thisMinTopicOffset) {
+            for ((t: TopicPartition, o: Long) <- thisMaxTopicOffset) {
                 val res = consumerConsole.resetPartitionToTargetOffset(groupId, t, o + thatDiffOffset.get(t).get)
                 if (!res._1) {
                     log.error(s"reset $t offset failed")
@@ -164,14 +164,14 @@ class OperationConsole(config: KafkaConfig, topicConsole: TopicConsole,
     }
 
     /**
-     * check partition consistency and fetch the min offset for the topic.
+     * check partition consistency and fetch the min offset for the that kafka topic, max offset for this kafka.
      *
      * @param groupId group id.
      * @param topic   topic.
      * @param props   other kafka cluster config.
-     * @return _1: this min offset, _2: that min offset.
+     * @return _1: this max offset, _2: that min offset.
      */
-    def checkAndFetchMinOffset(groupId: String, topic: String,
+    def checkAndFetchOffset(groupId: String, topic: String,
         props: Properties): (util.Map[TopicPartition, Long], util.Map[TopicPartition, Long]) = {
         val thatAdmin = createAdminClient(props)
         val thatConsumer = new KafkaConsumer(props, new ByteArrayDeserializer, new ByteArrayDeserializer)
@@ -186,9 +186,9 @@ class OperationConsole(config: KafkaConfig, topicConsole: TopicConsole,
                 throw new IllegalStateException("topic partition inconsistent.")
             }
             val thatMinTopicOffset = thatConsumer.beginningOffsets(thatTopicPartitions.asJava)
-            val thisMinTopicOffset = topicConsole.getTopicOffset(topic, thisTopicPartitions.asJava)._1
+            val thisMaxTopicOffset = topicConsole.getTopicOffset(topic, thisTopicPartitions.asJava)._2
 
-            (thisMinTopicOffset, thatMinTopicOffset).asInstanceOf[(util.Map[TopicPartition, Long], util.Map[TopicPartition, Long])]
+            (thisMaxTopicOffset, thatMinTopicOffset).asInstanceOf[(util.Map[TopicPartition, Long], util.Map[TopicPartition, Long])]
         } finally {
             thatAdmin.close()
             thatConsumer.close()