diff --git a/PartyArray.java b/PartyArray.java
index 8d1ed62..edf77ea 100644
--- a/PartyArray.java
+++ b/PartyArray.java
@@ -8,28 +8,76 @@ public class PartyArray {
     private static Map<UUID, Party> m_PartyArray = new HashMap<UUID, Party>();
 
     private static Map<String, UUID> m_PartyNameList = new HashMap<String, UUID>();
-    public void CreateParty(UUID PartyUUID, String Name, UUID PlayerUUID){
-        m_PartyArray.put(PartyUUID, new Party(Name, PlayerUUID));
-        m_PartyNameList.put(Name, PartyUUID);
+
+    UserInfoArray m_UserInfoArray;
+
+    public PartyArray(UserInfoArray m_UIA){
+        m_UserInfoArray = m_UIA;
+    }
+    public boolean CreateParty(UUID PartyUUID, String Name, UUID PlayerUUID){
+        if(m_PartyNameList.containsKey(Name)){
+            return false; // Conflict
+        } else{
+            m_PartyArray.put(PartyUUID, new Party(Name, PlayerUUID));
+            m_PartyNameList.put(Name, PartyUUID);
+            return true;
+        }
     }
 
-    public void SignUpParty(UUID PartyUUID, UUID PlayerUUID){
-        Party m_Party = m_PartyArray.get(PartyUUID);
-        m_Party.SignUp(PlayerUUID);
+    public boolean DeleteParty(UUID PartyUUID){
+        if(m_PartyArray.containsKey(PartyUUID)){
+            for(UUID key: GetPartyMembersUUID(PartyUUID)){
+                m_UserInfoArray.setUserPartyUUID(key, new UUID(0,0));
+            }
+
+            m_PartyNameList.remove(GetPartyName(PartyUUID));
+            m_PartyArray.remove(PartyUUID);
+            return true;
+        }
+        else{
+            return false; // Party is not exists.
+        }
+
     }
 
-    public void ExpulsionParty(UUID PartyUUID, UUID PlayerUUID){
-        Party m_Party = m_PartyArray.get(PartyUUID);
-        m_Party.Expulsion(PlayerUUID);
+    public Integer SignUpParty(UUID PartyUUID, UUID PlayerUUID){
+        if(m_PartyArray.containsKey(PartyUUID)){
+            if(isOffline(PlayerUUID)){
+                Party m_Party = m_PartyArray.get(PartyUUID);
+                m_Party.SignUp(PlayerUUID);
+                m_UserInfoArray.setUserPartyUUID(PlayerUUID,PartyUUID);
+                return 1; // Success
+            }else{
+                return 2; // Offline Player
+            }
+        } else{
+            return 3; // Wrong Party
+        }
     }
 
-    public List<String> GetPartyMembers(UUID PartyUUID){
+    public boolean ExpulsionPartyPlayer(UUID PartyUUID, UUID PlayerUUID){
+        if(GetPartyMembersName(PartyUUID).contains(PlayerUUID)) {
+            Party m_Party = m_PartyArray.get(PartyUUID);
+            m_Party.Expulsion(PlayerUUID);
+            return true;
+        } else{
+            return false; // Wrong Player Name. FIXME{Need Checking function for a validate user name's }
+            /* Player op = Bukkit.getPlayer(args[1]);
+                            if (op != null) {
+            */
+        }
+    }
+
+    public List<String> GetPartyMembersName(UUID PartyUUID){
         List<String> MembersName = new ArrayList<>();
         for (UUID key : m_PartyArray.get(PartyUUID).getGroupMembers()){
             MembersName.add(Bukkit.getPlayer(key).getDisplayName());
         }
         return MembersName;
     }
+    public List<UUID> GetPartyMembersUUID(UUID PartyUUID){
+        return m_PartyArray.get(PartyUUID).getGroupMembers();
+    }
     public boolean isPartyMember(UUID PartyUUID, UUID PlayerUUID){
         Party m_Party = m_PartyArray.get(PartyUUID);
         return m_Party.isMember(PlayerUUID);
@@ -39,8 +87,17 @@ public class PartyArray {
         return m_PartyNameList.keySet();
     }
 
+
     public String GetPartyName(UUID PartyUUID){
         Party m_Party = m_PartyArray.get(PartyUUID);
         return m_Party.getGroupName();
     }
+    public static boolean isOffline(UUID uuid){
+        return Bukkit.getPlayer(uuid).equals(null) && !Bukkit.getOfflinePlayer(uuid).equals(null);
+    }
+
+    private boolean isAvaliableParty(UUID PartyUUID){
+        return m_PartyArray.containsKey(PartyUUID);
+    }
+
 }
diff --git a/PartyEventHandler.java b/PartyEventHandler.java
index 14ce2be..3318819 100644
--- a/PartyEventHandler.java
+++ b/PartyEventHandler.java
@@ -28,7 +28,7 @@ public class PartyEventHandler implements CommandExecutor {
                     m_UserInfoArray.setUserPartyUUID(p.getUniqueId(), tempUUID);
                     p.sendMessage(args[1]+"파티가 생성되었습니다.");
                     p.sendMessage("멤버 목록: ");
-                    for (String Name: m_PartyArray.GetPartyMembers(tempUUID)){
+                    for (String Name: m_PartyArray.GetPartyMembersName(tempUUID)){
                         p.sendMessage(Name);
                     }
                     p.sendMessage("파티 목록:");
diff --git a/User_DB.java b/User_DB.java
index 5f211dd..7ff3078 100644
--- a/User_DB.java
+++ b/User_DB.java
@@ -11,9 +11,8 @@ import java.sql.Statement;
 public final class User_DB extends JavaPlugin implements Listener {
 
     AccountArray m_AccountArrayInstance = new AccountArray();
-    PartyArray m_PartyArrayInstance = new PartyArray();
     UserInfoArray m_InfoArrayInstance = new UserInfoArray(); // UserInfo저장하는 Array instance 생성
-
+    PartyArray m_PartyArrayInstance = new PartyArray(m_InfoArrayInstance);
 
     DBUpdate Database_backup = new DBUpdate(m_InfoArrayInstance, m_AccountArrayInstance);
     @Override