diff --git a/smart-mqtt-broker/src/main/java/org/smartboot/mqtt/broker/topic/TopicQosConsumerRecord.java b/smart-mqtt-broker/src/main/java/org/smartboot/mqtt/broker/topic/TopicQosConsumerRecord.java
index db950bc..91676fc 100644
--- a/smart-mqtt-broker/src/main/java/org/smartboot/mqtt/broker/topic/TopicQosConsumerRecord.java
+++ b/smart-mqtt-broker/src/main/java/org/smartboot/mqtt/broker/topic/TopicQosConsumerRecord.java
@@ -32,7 +32,7 @@
  */
 public class TopicQosConsumerRecord extends TopicConsumerRecord {
 
-    protected final AtomicBoolean semaphore = new AtomicBoolean(false);
+    private final AtomicBoolean semaphore = new AtomicBoolean(false);
 
 
     public TopicQosConsumerRecord(BrokerTopic topic, MqttSession session, TopicSubscriber topicSubscriber, long nextConsumerOffset) {
@@ -55,6 +55,7 @@ public void pushToClient() {
 
     private void push0() {
         Message message = topic.getMessageQueue().get(nextConsumerOffset);
+        //消息队列已消费至最新点位
         if (message == null) {
             if (semaphore.compareAndSet(true, false)) {
                 topic.addSubscriber(this);
@@ -64,6 +65,17 @@ private void push0() {
             }
             return;
         }
+        int available = mqttSession.getInflightQueue().available();
+        //当前连接的飞行窗口已满
+        if (mqttSession.getInflightQueue().available() == 0) {
+            if (semaphore.compareAndSet(true, false)) {
+                topic.addSubscriber(this);
+                if (mqttSession.getInflightQueue().available() > 0) {
+                    topic.push();
+                }
+            }
+            return;
+        }
 
         MqttMessageBuilders.PublishBuilder publishBuilder = MqttMessageBuilders.publish().payload(message.getPayload()).qos(mqttQoS).topic(message.getTopicBytes());
         if (mqttSession.getMqttVersion() == MqttVersion.MQTT_5) {
@@ -72,18 +84,11 @@ private void push0() {
         topic.getMessageQueue().commit(message.getOffset());
         nextConsumerOffset = message.getOffset() + 1;
 
-        CompletableFuture<MqttPacketIdentifierMessage<? extends MqttPacketIdVariableHeader>> future = mqttSession.getInflightQueue().offer(publishBuilder, () -> {
-            if (semaphore.compareAndSet(true, false)) {
-                topic.addSubscriber(this);
-            }
-            topic.push();
-        });
-        if (future == null) {
-            return;
+        CompletableFuture<MqttPacketIdentifierMessage<? extends MqttPacketIdVariableHeader>> future = mqttSession.getInflightQueue().offer(publishBuilder);
+        if (available == 1) {
+            future.whenComplete((mqttPacketIdentifierMessage, throwable) -> push0());
+        } else {
+            push0();
         }
-        future.whenComplete((mqttPacketIdentifierMessage, throwable) -> push0());
-
-        push0();
     }
-
 }
diff --git a/smart-mqtt-common/src/main/java/org/smartboot/mqtt/common/InflightQueue.java b/smart-mqtt-common/src/main/java/org/smartboot/mqtt/common/InflightQueue.java
index 26c3419..674691d 100644
--- a/smart-mqtt-common/src/main/java/org/smartboot/mqtt/common/InflightQueue.java
+++ b/smart-mqtt-common/src/main/java/org/smartboot/mqtt/common/InflightQueue.java
@@ -36,6 +36,8 @@
  * @version V1.0 , 2022/4/26
  */
 public class InflightQueue {
+    public static final Runnable EMPTY_RUNNABLE = () -> {
+    };
     private static final Logger LOGGER = LoggerFactory.getLogger(InflightQueue.class);
     private static final int TIMEOUT = 30;
     private final InflightMessage[] queue;
@@ -65,9 +67,11 @@ public synchronized CompletableFuture<MqttPacketIdentifierMessage<? extends Mqtt
     }
 
     public CompletableFuture<MqttPacketIdentifierMessage<? extends MqttPacketIdVariableHeader>> offer(MqttMessageBuilders.MessageBuilder publishBuilder) {
-        return offer(publishBuilder, () -> {
+        return offer(publishBuilder, EMPTY_RUNNABLE);
+    }
 
-        });
+    public int available() {
+        return queue.length - count;
     }
 
     public synchronized CompletableFuture<MqttPacketIdentifierMessage<? extends MqttPacketIdVariableHeader>> offer(MqttMessageBuilders.MessageBuilder publishBuilder, Runnable runnable) {