diff --git a/src/main/java/love/sola/netsupport/api/ProfileModify.java b/src/main/java/love/sola/netsupport/api/ProfileModify.java
index 3319733..12624a4 100644
--- a/src/main/java/love/sola/netsupport/api/ProfileModify.java
+++ b/src/main/java/love/sola/netsupport/api/ProfileModify.java
@@ -1,8 +1,13 @@
 package love.sola.netsupport.api;
 
 import com.google.gson.Gson;
+import love.sola.netsupport.enums.Attribute;
+import love.sola.netsupport.pojo.User;
 import love.sola.netsupport.sql.SQLCore;
+import love.sola.netsupport.util.Checker;
 import love.sola.netsupport.util.ParseUtil;
+import love.sola.netsupport.wechat.Command;
+import me.chanjar.weixin.common.session.WxSession;
 
 import javax.servlet.ServletException;
 import javax.servlet.annotation.WebServlet;
@@ -38,6 +43,17 @@ public class ProfileModify extends HttpServlet {
 	}
 
 	private Response process(HttpServletRequest request) {
+		WxSession session = Checker.isAuthorized(request, Command.QUERY);
+		if (session == null) {
+			return new Response(Response.ResponseCode.UNAUTHORIZED);
+		}
+		User u = (User) session.getAttribute(Attribute.USER);
+		if (u == null) return new Response(Response.ResponseCode.UNAUTHORIZED);
+		String isp = request.getParameter("isp");
+		String netaccount = request.getParameter("username");
+		String block = request.getParameter("block");
+		String room = request.getParameter("room");
+		String phone = request.getParameter("phone");
 		return null;
 	}
 
diff --git a/src/main/java/love/sola/netsupport/api/Register.java b/src/main/java/love/sola/netsupport/api/Register.java
index 1cebc8a..c647f0f 100644
--- a/src/main/java/love/sola/netsupport/api/Register.java
+++ b/src/main/java/love/sola/netsupport/api/Register.java
@@ -20,6 +20,8 @@ import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;
 import java.io.PrintWriter;
 
+import static love.sola.netsupport.util.Checker.*;
+
 /**
  * ***********************************************
  * Created by Sola on 2015/11/29.
@@ -29,8 +31,6 @@ import java.io.PrintWriter;
 @WebServlet(name = "Register", urlPatterns = "/api/register", loadOnStartup = 21)
 public class Register extends HttpServlet {
 
-	public static final String STUDENT_ID_REGEX = "^(2010|2012|2013|2014|2015)[0-9]{9}$";
-	public static final String PHONE_NUMBER_REGEX = "^1[34578][0-9]{9}$";
 
 	private Gson gson = SQLCore.gson;
 
@@ -105,66 +105,6 @@ public class Register extends HttpServlet {
 		return "Register_Success";
 	}
 
-
-	private long checkStudentId(String studentId) {
-		if (studentId == null) return -1;
-		if (studentId.matches(STUDENT_ID_REGEX)) {
-			try {
-				return Long.parseLong(studentId);
-			} catch (NumberFormatException ignored) {
-			}
-		}
-		return -1;
-	}
-
-	private long checkPhoneNumber(String phone) {
-		if (phone == null) return -1;
-		if (phone.matches(PHONE_NUMBER_REGEX)) {
-			try {
-				return Long.parseLong(phone);
-			} catch (NumberFormatException ignored) {
-			}
-		}
-		return -1;
-	}
-
-	private ISP checkISP(String isp) {
-		if (isp == null) return null;
-		try {
-			return ISP.fromId(Integer.parseInt(isp));
-		} catch (NumberFormatException ignored) {
-		}
-		return null;
-	}
-
-	private String checkNetAccount(String account, ISP isp) {
-		if (isp == null) return null;
-		if (account == null) return null;
-		if (!account.matches(isp.accountRegex)) return null;
-		return account;
-	}
-
-	private int checkBlock(String block) {
-		if (block == null) return -1;
-		try {
-			return Integer.parseInt(block);
-		} catch (NumberFormatException ignored) {
-		}
-		return -1;
-	}
-
-	private int checkRoom(String room, int block) {
-		if (block == -1) return -1;
-		if (room == null) return -1;
-		try {
-			Integer i = Integer.parseInt(room);
-			if (i <= 100 || i >= 1300) return -1;
-			return i;
-		} catch (NumberFormatException ignored) {
-		}
-		return -1;
-	}
-
 	private void printAuthorizeFailed(HttpServletRequest request, PrintWriter out) {
 		out.println(ParseUtil.parseJsonP(request, gson.toJson(new Response(Response.ResponseCode.AUTHORIZE_FAILED))));
 		out.close();
diff --git a/src/main/java/love/sola/netsupport/enums/Block.java b/src/main/java/love/sola/netsupport/enums/Block.java
index 2526e0b..c14d370 100644
--- a/src/main/java/love/sola/netsupport/enums/Block.java
+++ b/src/main/java/love/sola/netsupport/enums/Block.java
@@ -53,4 +53,45 @@ public class Block {
 		}
 	}
 
+	public static final int[][] AVAILABLE = new int[62][0];
+
+	static {
+		// -------------------------------------------- //
+		// THANKS DATA PROVIDED BY Lai Juncheng
+		// -------------------------------------------- //
+		AVAILABLE[FX_1]     =   new int[]{108, 208, 308, 408, 508};
+		AVAILABLE[FX_2]     =   new int[]{110, 210, 310, 410, 510, 610};
+		AVAILABLE[FX_3]     =   new int[]{110, 210, 310, 410, 510, 610};
+		AVAILABLE[FX_4]     =   new int[]{110, 210, 310, 410, 510, 610, 710};
+		AVAILABLE[FX_5]     =   new int[]{108, 208, 308, 408, 508, 608, 708};
+		AVAILABLE[BM_7]     =   new int[]{100, 216, 317, 417, 517, 617, 717};
+		AVAILABLE[BM_8]     =   new int[]{100, 221, 321, 421, 521, 621, 721};
+		AVAILABLE[BM_9]     =   new int[]{100, 221, 321, 421, 521, 621};
+		AVAILABLE[BM_10]    =   new int[]{111, 239, 339, 439, 558, 658, 758, 858};
+		AVAILABLE[BM_11]    =   new int[]{100, 220, 320, 420, 520, 620, 720, 820};
+		AVAILABLE[DM_12]    =   new int[]{119, 221, 321, 421, 521, 621, 720};
+		AVAILABLE[DM_13]    =   new int[]{120, 222, 322, 422, 522, 622, 722};
+		AVAILABLE[DM_14]    =   new int[]{100, 230, 330, 430, 530, 630, 730};
+		AVAILABLE[DM_15]    =   new int[]{119, 219, 319, 419, 519, 619};
+		AVAILABLE[QT_16]    =   new int[]{154, 257, 357, 457, 557, 657, 757};
+		AVAILABLE[QT_17]    =   new int[]{154, 257, 357, 457, 557, 657, 757};
+		AVAILABLE[QT_18]    =   new int[]{139, 239, 339, 439, 539, 639, 739};
+		AVAILABLE[QT_19]    =   new int[]{100, 200, 332, 432, 532, 632, 732};
+		AVAILABLE[DM_20]    =   new int[]{109, 209, 309, 409, 509, 609, 709};
+		AVAILABLE[DM_21]    =   new int[]{109, 209, 309, 409, 509, 609, 709};
+		AVAILABLE[XH_A]     =   new int[]{129, 231, 331, 431, 531, 631, 731, 831, 931, 1031, 1131, 1231};
+		AVAILABLE[XH_B]     =   new int[]{129, 229, 329, 429, 529, 629, 729, 829, 929, 1029, 1129, 1229};
+		AVAILABLE[XH_C]     =   new int[]{126, 226, 326, 426, 526, 626, 726, 826, 926, 1026, 1126, 1226};
+		AVAILABLE[XH_D]     =   new int[]{128, 228, 328, 428, 528, 628, 728, 828, 928, 1028, 1128, 1228};
+		AVAILABLE[FX_6]     =   new int[0];
+	}
+
+	public static boolean checkRoom(int block, int room) {
+		int floor = room / 100;
+		if (floor == 0 || room % 100 == 0) return false;
+		if (block < 0 || block >= AVAILABLE.length) return false;
+		if (AVAILABLE[block].length < floor) return false;
+		return room <= AVAILABLE[block][floor - 1];
+	}
+
 }
diff --git a/src/main/java/love/sola/netsupport/util/Checker.java b/src/main/java/love/sola/netsupport/util/Checker.java
index d806704..d0cd3b5 100644
--- a/src/main/java/love/sola/netsupport/util/Checker.java
+++ b/src/main/java/love/sola/netsupport/util/Checker.java
@@ -1,6 +1,8 @@
 package love.sola.netsupport.util;
 
 import love.sola.netsupport.enums.Attribute;
+import love.sola.netsupport.enums.Block;
+import love.sola.netsupport.enums.ISP;
 import love.sola.netsupport.wechat.Command;
 import love.sola.netsupport.wechat.WechatSession;
 import me.chanjar.weixin.common.session.WxSession;
@@ -15,6 +17,9 @@ import javax.servlet.http.HttpServletRequest;
  */
 public class Checker {
 
+	public static final String STUDENT_ID_REGEX = "^(2010|2012|2013|2014|2015)[0-9]{9}$";
+	public static final String PHONE_NUMBER_REGEX = "^1[34578][0-9]{9}$";
+
 	public static boolean hasNull(Object... v) {
 		for (Object o : v) if (o == null) return true;
 		return false;
@@ -27,4 +32,64 @@ public class Checker {
 		return s == null ? null : s.getAttribute(Attribute.AUTHORIZED) == c ? s : null;
 	}
 
+	public static long checkStudentId(String studentId) {
+		if (studentId == null) return -1;
+		if (studentId.matches(STUDENT_ID_REGEX)) {
+			try {
+				return Long.parseLong(studentId);
+			} catch (NumberFormatException ignored) {
+			}
+		}
+		return -1;
+	}
+
+	public static long checkPhoneNumber(String phone) {
+		if (phone == null) return -1;
+		if (!phone.matches(PHONE_NUMBER_REGEX)) return -1;
+		try {
+			return Long.parseLong(phone);
+		} catch (NumberFormatException ignored) { }
+		return -1;
+	}
+
+	public static ISP checkISP(String isp) {
+		if (isp == null) return null;
+		try {
+			return ISP.fromId(Integer.parseInt(isp));
+		} catch (NumberFormatException ignored) { }
+		return null;
+	}
+
+	public static String checkNetAccount(String account, ISP isp) {
+		if (isp == null) return null;
+		if (account == null) return null;
+		if (!account.matches(isp.accountRegex)) return null;
+		return account;
+	}
+
+	public static int checkBlock(String block) {
+		if (block == null) return -1;
+		try {
+			int b = Integer.parseInt(block);
+			if (Block.inverseMap.containsKey(b))
+				return b;
+			else
+				return -1;
+		} catch (NumberFormatException ignored) { }
+		return -1;
+	}
+
+	public static int checkRoom(String room, int block) {
+		if (block == -1) return -1;
+		if (room == null) return -1;
+		try {
+			Integer i = Integer.parseInt(room);
+			if (Block.checkRoom(block, i))
+				return i;
+			else
+				return -1;
+		} catch (NumberFormatException ignored) { }
+		return -1;
+	}
+
 }