diff --git a/.gitignore b/.gitignore
index 9ca7801..0bdcdf8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
 # Compiled class file
 *.class
-
+.idea
+*.iml
 # Log file
 *.log
 
diff --git a/src/main/java/net/ipip/ipdb/MetaData.java b/src/main/java/net/ipip/ipdb/MetaData.java
index 7b844e9..1517564 100644
--- a/src/main/java/net/ipip/ipdb/MetaData.java
+++ b/src/main/java/net/ipip/ipdb/MetaData.java
@@ -1,5 +1,7 @@
 package net.ipip.ipdb;
 
+import com.alibaba.fastjson.annotation.JSONField;
+
 import java.util.Map;
 
 /**
@@ -7,9 +9,12 @@
  */
 public class MetaData {
     public int Build;
+    @JSONField(name = "ip_version")
     public int IPVersion;
+    @JSONField(name = "node_count")
     public int nodeCount;
     public Map<String, Integer> Languages;
     public String[] Fields;
+    @JSONField(name = "total_size")
     public int totalSize;
 }
\ No newline at end of file