diff --git a/src/main/java/org/ntlab/citrusserver/entities/Account.java b/src/main/java/org/ntlab/citrusserver/entities/Account.java
index a5aa746..37cbba8 100644
--- a/src/main/java/org/ntlab/citrusserver/entities/Account.java
+++ b/src/main/java/org/ntlab/citrusserver/entities/Account.java
@@ -1,10 +1,10 @@
 package org.ntlab.citrusserver.entities;
 
 public class Account {
-    String introduction;
-    int bookcount = 0;
-    String accountId;
-    String password;
+    private String introduction;
+    private int bookcount = 0;
+    private String accountId;
+    private String password;
 
     public Account(String aid, String pass) {
         accountId = aid;