diff --git a/src/main/java/org/ntlab/amaryllis/server/entities/Account.java b/src/main/java/org/ntlab/amaryllis/server/entities/Account.java
new file mode 100644
index 0000000..9aef321
--- /dev/null
+++ b/src/main/java/org/ntlab/amaryllis/server/entities/Account.java
@@ -0,0 +1,24 @@
+package org.ntlab.amaryllis.server.entities;
+
+import java.util.ArrayList;
+
+public class Account {
+    private String uid;
+    private String name;
+    private String token;
+    private String password;
+    private String introduction;
+    private ArrayList<String> followings;
+    private ArrayList<String> followers;
+    private ArrayList<String> history;
+    private ArrayList<String> contributions;
+    public Account(String name,String password){
+        this.name=name;
+        this.password=password;
+        followings=new ArrayList<>();
+        followers=new ArrayList<>();
+        history=new ArrayList<>();
+        contributions=new ArrayList<>();
+    }
+
+}
diff --git a/src/main/java/org/ntlab/amaryllis/server/models/Accounts.java b/src/main/java/org/ntlab/amaryllis/server/models/Accounts.java
new file mode 100644
index 0000000..44bedc8
--- /dev/null
+++ b/src/main/java/org/ntlab/amaryllis/server/models/Accounts.java
@@ -0,0 +1,22 @@
+package org.ntlab.amaryllis.server.models;
+
+import org.ntlab.amaryllis.server.entities.Account;
+
+import java.util.ArrayList;
+
+public class Accounts {
+    private static Accounts theInstance=null;
+    private ArrayList<Account> accounts=new ArrayList<Account>();
+    private Accounts(){
+
+    }
+
+    public static Accounts getInstance(){
+        if(theInstance==null){
+            theInstance=new Accounts();
+        }
+
+        return theInstance;
+    }
+
+}
diff --git a/src/main/java/org/ntlab/amaryllis/server/resources/Account.java b/src/main/java/org/ntlab/amaryllis/server/resources/Account.java
deleted file mode 100644
index 97e7fa9..0000000
--- a/src/main/java/org/ntlab/amaryllis/server/resources/Account.java
+++ /dev/null
@@ -1,24 +0,0 @@
-package org.ntlab.amaryllis.server.resources;
-
-import java.util.ArrayList;
-
-public class Account {
-    private String uid;
-    private String name;
-    private String token;
-    private String password;
-    private String introduction;
-    private ArrayList<String> followings;
-    private ArrayList<String> followers;
-    private ArrayList<String> history;
-    private ArrayList<String> contributions;
-    public Account(String name,String password){
-        this.name=name;
-        this.password=password;
-        followings=new ArrayList<>();
-        followers=new ArrayList<>();
-        history=new ArrayList<>();
-        contributions=new ArrayList<>();
-    }
-
-}
diff --git a/src/main/java/org/ntlab/amaryllis/server/resources/AccountsRest.java b/src/main/java/org/ntlab/amaryllis/server/resources/AccountsRest.java
index 85c4b38..ef077d6 100644
--- a/src/main/java/org/ntlab/amaryllis/server/resources/AccountsRest.java
+++ b/src/main/java/org/ntlab/amaryllis/server/resources/AccountsRest.java
@@ -1,6 +1,7 @@
 package org.ntlab.amaryllis.server.resources;
 
 
+import org.ntlab.amaryllis.server.models.Accounts;
 import org.springframework.stereotype.Component;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
@@ -14,7 +15,7 @@
 @Component
 @Path("/accounts")
 public class AccountsRest {
-    private ArrayList<String> accounts;
+    private Accounts accounts=Accounts.getInstance();
 
     @GET
     public String getAccounts(){
@@ -32,4 +33,5 @@
         return json;
     }
 
+
 }
\ No newline at end of file