diff --git a/liteflow-core/src/main/java/com/yomahub/liteflow/entity/data/DataBus.java b/liteflow-core/src/main/java/com/yomahub/liteflow/entity/data/DataBus.java
index 577b5e374..8aba0fc65 100644
--- a/liteflow-core/src/main/java/com/yomahub/liteflow/entity/data/DataBus.java
+++ b/liteflow-core/src/main/java/com/yomahub/liteflow/entity/data/DataBus.java
@@ -30,9 +30,9 @@ public class DataBus {
 
 	public static AtomicInteger OCCUPY_COUNT = new AtomicInteger(0);
 
-	private static AtomicReferenceArray<Slot> SLOTS;
+	private static final AtomicReferenceArray<Slot> SLOTS;
 
-	private static ConcurrentLinkedQueue<Integer> QUEUE;
+	private static final ConcurrentLinkedQueue<Integer> QUEUE;
 
 	static {
 		LiteflowConfig liteflowConfig = LiteflowConfigGetter.get();