diff --git a/src/main/java/com/iflytop/a800/device/Incubator.java b/src/main/java/com/iflytop/a800/device/Incubator.java
index 5b5f075..7f76020 100644
--- a/src/main/java/com/iflytop/a800/device/Incubator.java
+++ b/src/main/java/com/iflytop/a800/device/Incubator.java
@@ -9,9 +9,12 @@ import java.util.Map;
 public class Incubator {
     // 槽位
     private final List<IncubatorSlot> slots;
+    // 槽位起始索引
+    private Integer slotStartIndex = 0;
 
     // 构造函数
     public Incubator() {
+        this.slotStartIndex = 0;
         this.slots = new ArrayList<>();
         for ( int i = 0; i < 20; i++ ) {
             var slot = new IncubatorSlot();
@@ -20,14 +23,20 @@ public class Incubator {
         }
     }
 
+    public void lock() {}
+    public void unlock() {}
+
     // 推送新卡片
     public IncubatorSlot pushNewCard(TestCard card) {
         IncubatorSlot slot = null;
-        for ( var s : this.slots ) {
-            if ( s.card == null ) {
-                slot = s;
-                break;
+        for ( int i=0; i<20; i++ ) {
+            var tmpSlot = this.slots.get(this.slotStartIndex);
+            this.slotStartIndex = (this.slotStartIndex + 1) % 20;
+            if ( tmpSlot.card != null ) {
+                continue ;
             }
+            slot = tmpSlot;
+            break;
         }
         if ( slot == null ) {
             throw new RuntimeException("无可用孵育盘槽位");