diff --git a/src/web/js/lib/account_validator.js b/src/web/js/lib/account_validator.js
new file mode 100644
index 0000000..3d892a3
--- /dev/null
+++ b/src/web/js/lib/account_validator.js
@@ -0,0 +1,54 @@
+class AccountValidator {
+
+	constructor() {
+		this.patternMaestroID = /^[A-Za-z]{1}[A-Za-z0-9]{3,19}$/;
+		this.patternMaestroPW = /^[A-Za-z0-9]{4,16}$/;
+	}
+
+	isValidMaestroID(textID) {
+		if(!this.patternMaestroID.test(textID))
+			return false;
+
+		return true;
+	}
+
+	messageForInvalidMaestroID(textID) {
+		if(textID.length < AccountValidator.MAESTRO_ID_LENGTH_MINIMUM)
+			return "마에스트로 계정명은 " + AccountValidator.MAESTRO_ID_LENGTH_MINIMUM + "글자 이상이어야 합니다.";
+		else if(textID.length > AccountValidator.MAESTRO_ID_LENGTH_MAXIMUM)
+			return "마에스트로 계정명은 " + AccountValidator.MAESTRO_ID_LENGTH_MAXIMUM + "글자 이하이어야 합니다.";
+		else if(!(/^[A-Za-z]/.test(textID)))
+			return "마에스트로 계정명은 알파벳으로 시작해야 합니다.";
+		else if((/[^\w]/g).test(textID))
+			return "마에스트로 계정명은 알파벳과 숫자로만 적어주세요.";
+	}
+
+
+	isValidMaestroPW(textPW) {
+		if(!this.patternMaestroPW.test(textPW))
+			return false;
+
+		return true;
+	}
+
+	messageForInvalidMaestroPW(textPW) {
+		console.log(textPW);
+		if(textPW.length < AccountValidator.MAESTRO_PW_LENGTH_MINIMUM)
+			return "마에스트로의 암호는 " + AccountValidator.MAESTRO_PW_LENGTH_MINIMUM + "글자 이상이어야 합니다.";
+		else if(textPW.length > AccountValidator.MAESTRO_PW_LENGTH_MAXIMUM)
+			return "마에스트로의 암호는 " + AccountValidator.MAESTRO_PW_LENGTH_MAXIMUM + "글자 이하이어야 합니다.";
+		else if((/[^\w]/g).test(textPW))
+			return "마에스트로의 암호는 알파벳과 숫자로만 적어주세요.";
+		else
+			return "???";
+	}
+
+
+}
+
+
+AccountValidator.MAESTRO_ID_LENGTH_MINIMUM		= 4;
+AccountValidator.MAESTRO_ID_LENGTH_MAXIMUM		= 20;
+
+AccountValidator.MAESTRO_PW_LENGTH_MINIMUM		= 4;
+AccountValidator.MAESTRO_PW_LENGTH_MAXIMUM		= 16;
\ No newline at end of file
diff --git a/src/web/main/register.html b/src/web/main/register.html
index 5f32ad6..156804b 100644
--- a/src/web/main/register.html
+++ b/src/web/main/register.html
@@ -10,6 +10,7 @@
 
 	<script type="text/javascript" src="./../../../resources/jquery/jquery-3.3.1.min.js"></script>
 	<script type="text/javascript" src="./../js/main.js"></script>
+	<script type="text/javascript" src="./../js/lib/account_validator.js"></script>
 	<script type="text/javascript" src="./../js/request_server.js"></script>
 	<script type="text/javascript">
 		$(document).ready(function() {
diff --git a/src/web/module/maestro_section_register.html b/src/web/module/maestro_section_register.html
index 63c0db4..163629b 100644
--- a/src/web/module/maestro_section_register.html
+++ b/src/web/module/maestro_section_register.html
@@ -38,15 +38,22 @@ let selectedAccountTypeText = "";
 
 let tab1, tab2, tab3;
 
+let accountValidator = new AccountValidator();
+
 $(document).ready(function() {
 	tab1 = $("#page-tabs li").filter(":eq(0)");
 	tab2 = $("#page-tabs li").filter(":eq(1)");
 	tab3 = $("#page-tabs li").filter(":eq(2)");
 });
 
-function check_id() {
+function checkMaestroID() {
 	maestro_name = $("#maestro_name").val();
 
+	if(!accountValidator.isValidMaestroID(maestro_name)) {
+		onErrorMaestroID(accountValidator.messageForInvalidMaestroID(maestro_name));
+		return;
+	}
+
 	sendRequestServer(	//url, sendParams, onSuccess, onFail, isDebugMode);
 		"./../server/maestro/check_id.php",
 		"maestro_name=" + maestro_name,
@@ -58,20 +65,31 @@ function check_id() {
 
 		(errorMessage, errorCode) => {
 			isAvailableID = false;
-
-			if($("#error_message").length) {
-				$("#error_message").text(errorMessage);
-			}
-
-			$("#maestro_name").val("");
-			$("#maestro_name").focus();
+			onErrorMaestroID(errorMessage);
 		}
 
 	);
 }
 
+function onErrorMaestroID(message) {
+	if($("#error_message").length) {
+		$("#error_message").text(message);
+	}
 
-function check_data() {
+	$("#maestro_name").val("");
+	$("#maestro_name").focus();
+}
+
+function onErrorMaestroPW(message) {
+	if($("#error_message").length) {
+		$("#error_message").text(message);
+	}
+
+	$("#password").val("");
+	$("#password").focus();
+}
+
+function checkData() {
 	if(!isAvailableID) {
 		$("#error_message").text("아이디 중복 확인을 해 주세요.");
 		$("#check_id").focus();
@@ -79,11 +97,15 @@ function check_data() {
 	}
 
 	password = $("#password").val();
-	if(password.length === 0) {
-		$("#error_message").text("패스워드를 입력해 주세요.");
-		$("#password").focus();
+	if(!accountValidator.isValidMaestroPW(password)) {
+		onErrorMaestroPW(accountValidator.messageForInvalidMaestroPW(password));
 		return;
 	}
+	// if(password.length === 0) {
+	// 	$("#error_message").text("패스워드를 입력해 주세요.");
+	// 	$("#password").focus();
+	// 	return;
+	// }
 
 	email = $("#email").val();
 	if(email.length === 0) {
@@ -110,6 +132,8 @@ function check_data() {
 	$(".account_type").append(selectedAccountTypeText);
 	$(".price_account").append(selectedAccountTypeText);
 
+	$("#error_message").text("");
+
 	$("#input_data").css("display", "none");
 	$("#register_account").css("display", "block");
 
@@ -170,7 +194,7 @@ function register_account() {
 	<div id="input_data">
 
 		(필수) 마에스트로 아이디 : <input type="text" id="maestro_name" value="test" >
-		<button  id="check_id" onClick="check_id()">중복 확인</button><br/>
+		<button  id="check_id" onClick="checkMaestroID()">중복 확인</button><br/>
 		(필수) 암호 : <input id="password" value="test" type="password" name="password"><br/>
 		(필수) 이메일 : <input id="email" value="test@test.com" name="email"><br/>
 		(필수) 학생 수 : 
@@ -211,7 +235,7 @@ function register_account() {
 		</ul>
 
 		<div class="col alignCenter">
-			<a id="maestro_register" class="btn btn-sea width400" onClick="check_data()">등록 신청</a>
+			<a id="maestro_register" class="btn btn-sea width400" onClick="checkData()">등록 신청</a>
 		</div>
 
 	</div>
diff --git a/src/web/server/admin/registered_maestro_list.php b/src/web/server/admin/registered_maestro_list.php
index 832282c..09b782a 100644
--- a/src/web/server/admin/registered_maestro_list.php
+++ b/src/web/server/admin/registered_maestro_list.php
@@ -55,7 +55,7 @@ function get_maestro_list_by_name($maestroName) {
 
 	$query = "
 		SELECT MaestroID, Name, AccountType FROM moty_maestro
-		WHERE Name=? AND ActivateStatus=0
+		WHERE Name LIKE CONCAT('%', ?, '%') AND ActivateStatus=0
 		ORDER BY MaestroID DESC
 	";
 	$stmt = $db_conn->prepare($query);
diff --git a/test/tdd.html b/test/tdd.html
index 5c6f498..b655729 100644
--- a/test/tdd.html
+++ b/test/tdd.html
@@ -13,6 +13,8 @@
 	<script src="https://code.jquery.com/qunit/qunit-2.6.0.js"></script>
 	<script src="../resources/js/phaser.min.js"></script>
 
+	<script src="../src/web/js/lib/account_validator.js"></script>
+
 	<script src="../src/game/typing/lib/typing_text_manager.js"></script>
 	<script src="../src/game/lib/score_manager.js"></script>
 	<script src="../src/game/lib/session_storage_manager.js"></script>
diff --git a/test/tdd.js b/test/tdd.js
index a0b8d44..53284cb 100644
--- a/test/tdd.js
+++ b/test/tdd.js
@@ -1,3 +1,67 @@
+//////////////////////////////////////////////////
+// AccountValidator
+
+let accountValidator = new AccountValidator();
+
+QUnit.test( "AccountValidator - isValidMaestroID", function( assert ) {
+	let text = "";
+	assert.equal(accountValidator.isValidMaestroID(text), false, "isValidMaestroID - no text");
+	text = "1abcde";
+	assert.equal(accountValidator.isValidMaestroID(text), false, "isValidMaestroID - " + text);
+	text = "abc";
+	assert.equal(accountValidator.isValidMaestroID(text), false, "isValidMaestroID - " + text);
+	text = "a1b";
+	assert.equal(accountValidator.isValidMaestroID(text), false, "isValidMaestroID - " + text);
+	text = "abcdeabcdeabcdeabcdea";
+	assert.equal(accountValidator.isValidMaestroID(text), false, "isValidMaestroID - " + text);
+
+	text = "abcd";
+	assert.equal(accountValidator.isValidMaestroID(text), true, "isValidMaestroID - " + text);
+	text = "aA1Bccd";
+	assert.equal(accountValidator.isValidMaestroID(text), true, "isValidMaestroID - " + text);
+	text = "abcdeabcdeabcdeabcde";
+	assert.equal(accountValidator.isValidMaestroID(text), true, "isValidMaestroID - " + text);
+});
+
+QUnit.test( "AccountValidator - isValidMaestroPW", function( assert ) {
+	let text = "";
+	text = "";
+	assert.equal(accountValidator.isValidMaestroPW(text), false, "isValidMaestroPW - " + text);
+	text = "1";
+	assert.equal(accountValidator.isValidMaestroPW(text), false, "isValidMaestroPW - " + text);
+	text = "12";
+	assert.equal(accountValidator.isValidMaestroPW(text), false, "isValidMaestroPW - " + text);
+	text = "123";
+	assert.equal(accountValidator.isValidMaestroPW(text), false, "isValidMaestroPW - " + text);
+	text = "1234";
+	assert.equal(accountValidator.isValidMaestroPW(text), true, "isValidMaestroPW - " + text);
+	text = "12345";
+	assert.equal(accountValidator.isValidMaestroPW(text), true, "isValidMaestroPW - " + text);
+	text = "123456";
+	assert.equal(accountValidator.isValidMaestroPW(text), true, "isValidMaestroPW - " + text);
+	text = "1234567";
+	assert.equal(accountValidator.isValidMaestroPW(text), false, "isValidMaestroPW - " + text);
+
+	assert.equal(accountValidator.isValidMaestroPW(text), false, "isValidMaestroPW - no text");
+	text = "1abcde";
+	assert.equal(accountValidator.isValidMaestroPW(text), false, "isValidMaestroPW - " + text);
+	text = "abc";
+	assert.equal(accountValidator.isValidMaestroPW(text), false, "isValidMaestroPW - " + text);
+	text = "a1b";
+	assert.equal(accountValidator.isValidMaestroPW(text), false, "isValidMaestroPW - " + text);
+	text = "abcdeabcdeabcdeabcdea";
+	assert.equal(accountValidator.isValidMaestroPW(text), false, "isValidMaestroPW - " + text);
+
+	text = "abcd";
+	assert.equal(accountValidator.isValidMaestroPW(text), false, "isValidMaestroPW - " + text);
+	text = "aA1Bccd";
+	assert.equal(accountValidator.isValidMaestroPW(text), false, "isValidMaestroPW - " + text);
+	text = "abcdeabcdeabcdeabcde";
+	assert.equal(accountValidator.isValidMaestroPW(text), false, "isValidMaestroID - " + text);
+});
+
+
+
 //////////////////////////////////////////////////
 // TypingTextManager
 
@@ -140,15 +204,15 @@ dbConnectManager.setMaestroID(0);
 dbConnectManager.setPlayerID(0);
 dbConnectManager.setDateTime("2018-05-16", "14:50:00");
 
-QUnit.test( "DBConnectManager - User login", function( assert ) {
+QUnit.test( "DBConnectManager - Player login", function( assert ) {
 	let returnPlayerID = -1;
 
 	let done = assert.async();
 	setTimeout(function() {
-		dbConnectManager.requestCheckUserLogin(
+		dbConnectManager.requestCheckPlayerLogin(
 			"jisangs", "test", "111111",
 			(jsonData) => {
-				returnPlayerID = jsonData["UserID"];
+				returnPlayerID = jsonData["PlayerID"];
 				assert.equal(returnPlayerID, 31);
 				done();
 			},
@@ -162,7 +226,7 @@ QUnit.test( "DBConnectManager - User login", function( assert ) {
 
 QUnit.test( "DBConnectManager - Player history", function( assert ) {
 	sessionStorageManager.maestroID = 1;	// jisangs
-	sessionStorageManager.playerUserID = "8";	// 부현율
+	sessionStorageManager.playerID = "8";	// 부현율
 	sessionStorageManager.playingAppID = 29;
 	let date = "2018-05-16";
 
@@ -205,13 +269,13 @@ QUnit.test( "DBConnectManager - Player ranking", function( assert ) {
 			(type, rankingRecordManager) => {
 				assert.equal(rankingRecordManager.getRankAt(0), 1, "hour");
 				assert.equal(rankingRecordManager.getBestRecordAt(0), 302.921, "hour");
-				assert.equal(rankingRecordManager.getUserIDAt(0), 5, "hour");
-				assert.equal(rankingRecordManager.getUserNameAt(0), "김지유", "hour");
+				assert.equal(rankingRecordManager.getPlayerIDAt(0), 5, "hour");
+				assert.equal(rankingRecordManager.getPlayerNameAt(0), "김지유", "hour");
 
 				assert.equal(rankingRecordManager.getRankAt(5), 6, "hour");
 				assert.equal(rankingRecordManager.getBestRecordAt(5), 128.436, "hour");
-				assert.equal(rankingRecordManager.getUserIDAt(5), 22, "hour");
-				assert.equal(rankingRecordManager.getUserNameAt(5), "모윤건", "hour");
+				assert.equal(rankingRecordManager.getPlayerIDAt(5), 22, "hour");
+				assert.equal(rankingRecordManager.getPlayerNameAt(5), "모윤건", "hour");
 
 				done();
 			}
@@ -227,13 +291,13 @@ QUnit.test( "DBConnectManager - Player ranking", function( assert ) {
 			(type, rankingRecordManager) => {
 				assert.equal(rankingRecordManager.getRankAt(0), 1, "day");
 				assert.equal(rankingRecordManager.getBestRecordAt(0), 313.304, "day");
-				assert.equal(rankingRecordManager.getUserIDAt(0), 19, "day");
-				assert.equal(rankingRecordManager.getUserNameAt(0), "오지운", "day");
+				assert.equal(rankingRecordManager.getPlayerIDAt(0), 19, "day");
+				assert.equal(rankingRecordManager.getPlayerNameAt(0), "오지운", "day");
 
 				assert.equal(rankingRecordManager.getRankAt(17), 18, "day");
 				assert.equal(rankingRecordManager.getBestRecordAt(17), 65.337, "day");
-				assert.equal(rankingRecordManager.getUserIDAt(17), 20, "day");
-				assert.equal(rankingRecordManager.getUserNameAt(17), "김민성", "day");
+				assert.equal(rankingRecordManager.getPlayerIDAt(17), 20, "day");
+				assert.equal(rankingRecordManager.getPlayerNameAt(17), "김민성", "day");
 
 				done();
 			}
@@ -249,13 +313,13 @@ QUnit.test( "DBConnectManager - Player ranking", function( assert ) {
 			(type, rankingRecordManager) => {
 				assert.equal(rankingRecordManager.getRankAt(0), 1, "month");
 				assert.equal(rankingRecordManager.getBestRecordAt(0), 617.231, "month");
-				assert.equal(rankingRecordManager.getUserIDAt(0), 50, "month");
-				assert.equal(rankingRecordManager.getUserNameAt(0), "강민준", "month");
+				assert.equal(rankingRecordManager.getPlayerIDAt(0), 50, "month");
+				assert.equal(rankingRecordManager.getPlayerNameAt(0), "강민준", "month");
 
 				assert.equal(rankingRecordManager.getRankAt(17), 18, "month");
 				assert.equal(rankingRecordManager.getBestRecordAt(17), 216.279, "month");
-				assert.equal(rankingRecordManager.getUserIDAt(17), 9, "month");
-				assert.equal(rankingRecordManager.getUserNameAt(17), "신예성", "month");
+				assert.equal(rankingRecordManager.getPlayerIDAt(17), 9, "month");
+				assert.equal(rankingRecordManager.getPlayerNameAt(17), "신예성", "month");
 
 				done();
 			}
@@ -307,7 +371,7 @@ QUnit.test( "DBConnectManager - UpdateRecord", function( assert ) {
 	setTimeout(function() {
 		dbConnectManager.requestTodayBestRecord(
 			1,	// maestro ID for "jisangs"
-			1,	// user ID for jisangs
+			1,	// Player ID for jisangs
 			101,	// space_invaders app ID
 			(jsonData) => {
 				todayBestRecord = jsonData["BestRecord"];
@@ -322,7 +386,7 @@ QUnit.test( "DBConnectManager - UpdateRecord", function( assert ) {
 	setTimeout(function() {
 		dbConnectManager.updateTodayBestRecord(
 			1,	// maestro ID for "jisangs"
-			1,	// user ID for jisangs
+			1,	// Player ID for jisangs
 			101,	// space_invaders app ID
 			todayBestRecord + 1000	// new record
 		);
@@ -331,7 +395,7 @@ QUnit.test( "DBConnectManager - UpdateRecord", function( assert ) {
 	setTimeout(function() {
 		dbConnectManager.requestTodayBestRecord(
 			1,	// maestro ID for "jisangs"
-			1,	// user ID for jisangs
+			1,	// Player ID for jisangs
 			101,	// space_invaders app ID
 			(jsonData) => {
 				let bestRecord = jsonData["BestRecord"];
@@ -497,11 +561,11 @@ QUnit.test( "RankingRecordManager - getAt", function( assert ) {
 	assert.equal(rankingRecordManager.getRankAt(0), 4);
 	assert.equal(rankingRecordManager.getRankAt(4), 8);
 
-	assert.equal(rankingRecordManager.getUserIDAt(0), 1);
-	assert.equal(rankingRecordManager.getUserIDAt(4), 5);
+	assert.equal(rankingRecordManager.getPlayerIDAt(0), 1);
+	assert.equal(rankingRecordManager.getPlayerIDAt(4), 5);
 
-	assert.equal(rankingRecordManager.getUserNameAt(0), "김남희");
-	assert.equal(rankingRecordManager.getUserNameAt(4), "신현주");
+	assert.equal(rankingRecordManager.getPlayerNameAt(0), "김남희");
+	assert.equal(rankingRecordManager.getPlayerNameAt(4), "신현주");
 
 	assert.equal(rankingRecordManager.getBestRecordAt(0), 1400);
 	assert.equal(rankingRecordManager.getBestRecordAt(4), 600);
@@ -544,15 +608,15 @@ QUnit.test( "SessionStorageManager - PlayerName", function( assert ) {
 	assert.equal(sessionStorageManager.playerName, null, "playerName");
 });
 
-QUnit.test( "SessionStorageManager - playerUserID", function( assert ) {
+QUnit.test( "SessionStorageManager - playerPlayerID", function( assert ) {
 	sessionStorageManager.clear();
-	assert.equal(sessionStorageManager.playerUserID, null, "playerUserID");
+	assert.equal(sessionStorageManager.playerID, null, "playerID");
 
-	sessionStorageManager.playerUserID = 1;
-	assert.equal(sessionStorageManager.playerUserID, 1, "playerUserID");
+	sessionStorageManager.playerID = 1;
+	assert.equal(sessionStorageManager.playerID, 1, "playerID");
 
-	sessionStorageManager.removeItem("playerUserID");
-	assert.equal(sessionStorageManager.playerUserID, null, "playerUserID");
+	sessionStorageManager.removeItem("playerID");
+	assert.equal(sessionStorageManager.playerID, null, "playerID");
 });
 
 QUnit.test( "SessionStorageManager - playingAppName", function( assert ) {