diff --git a/leaf-core/src/main/java/com/sankuai/inf/leaf/segment/model/SegmentBuffer.java b/leaf-core/src/main/java/com/sankuai/inf/leaf/segment/model/SegmentBuffer.java
index 567ab52f..61a3cbbd 100644
--- a/leaf-core/src/main/java/com/sankuai/inf/leaf/segment/model/SegmentBuffer.java
+++ b/leaf-core/src/main/java/com/sankuai/inf/leaf/segment/model/SegmentBuffer.java
@@ -52,7 +52,7 @@ public int getCurrentPos() {
     }
 
     public int nextPos() {
-        return (currentPos + 1) % 2;
+        return (currentPos + 1) & 1;
     }
 
     public void switchPos() {
diff --git a/zzg b/zzg
new file mode 100644
index 00000000..e69de29b