diff --git a/src/com/wentch/redkale/convert/bson/BsonReader.java b/src/com/wentch/redkale/convert/bson/BsonReader.java
index db453e32d..e94917d93 100644
--- a/src/com/wentch/redkale/convert/bson/BsonReader.java
+++ b/src/com/wentch/redkale/convert/bson/BsonReader.java
@@ -178,7 +178,9 @@ public final class BsonReader implements Reader {
      */
     @Override
     public int readArrayB() {
-        return readInt();
+        short bt = readShort();
+        if (bt == Reader.SIGN_NULL) return bt;
+        return (bt & 0xffff) << 16 | ((content[++this.position] & 0xff) << 8) | (content[++this.position] & 0xff);
     }
 
     @Override