diff --git a/projects/ucap-webmessenger-api-common/src/lib/apis/mass-talk-download.ts b/projects/ucap-webmessenger-api-common/src/lib/apis/mass-talk-download.ts
index cfbdc407..b786c9d1 100644
--- a/projects/ucap-webmessenger-api-common/src/lib/apis/mass-talk-download.ts
+++ b/projects/ucap-webmessenger-api-common/src/lib/apis/mass-talk-download.ts
@@ -4,8 +4,11 @@ import {
   APIResponse,
   APIEncoder,
   APIDecoder,
-  ParameterUtil
+  ParameterUtil,
+  JsonAnalization,
+  StatusCode
 } from '@ucap-webmessenger/api';
+import { JsonObject } from 'type-fest';
 
 export interface MassTalkDownloadRequest extends APIRequest {
   userSeq: number;
@@ -36,11 +39,19 @@ export const encodeMassTalkDownload: APIEncoder<MassTalkDownloadRequest> = (
 export const decodeMassTalkDownload: APIDecoder<MassTalkDownloadResponse> = (
   res: any
 ) => {
-  return {
-    statusCode: res.StatusCode,
-    errorMessage: res.ErrorMessage,
-    content: res.Content,
-    userName: res.UserName,
-    regDate: res.RegDate
-  } as MassTalkDownloadResponse;
+  try {
+    const json: JsonObject | Error = JsonAnalization.receiveAnalization(res);
+    return {
+      statusCode: json.StatusCode,
+      errorMessage: json.ErrorMessage,
+      content: json.Content,
+      userName: json.UserName,
+      regDate: json.RegDate
+    } as MassTalkDownloadResponse;
+  } catch (e) {
+    return {
+      statusCode: StatusCode.Fail,
+      errorMessage: e
+    } as MassTalkDownloadResponse;
+  }
 };
diff --git a/projects/ucap-webmessenger-api-common/src/lib/apis/mass-talk-save.ts b/projects/ucap-webmessenger-api-common/src/lib/apis/mass-talk-save.ts
index 648c3711..3f8a4fa4 100644
--- a/projects/ucap-webmessenger-api-common/src/lib/apis/mass-talk-save.ts
+++ b/projects/ucap-webmessenger-api-common/src/lib/apis/mass-talk-save.ts
@@ -4,25 +4,35 @@ import {
   APIResponse,
   APIEncoder,
   APIDecoder,
-  ParameterUtil
+  ParameterUtil,
+  StatusCode,
+  JsonAnalization
 } from '@ucap-webmessenger/api';
+import { JsonObject } from 'type-fest';
 
 export interface MassTalkSaveRequest extends APIRequest {
-  userSeq: string;
+  userSeq: number;
   deviceType: DeviceType;
   token: string;
   content?: string;
-  roomId?: string;
+  roomSeq?: string;
 }
 
 export interface MassTalkSaveResponse extends APIResponse {
-  EventMassSEQ?: string;
-  RoomID?: string;
-  RegDate?: string;
-  Content?: string;
+  eventMassSeq?: string;
+  roomID?: string;
+  regDate?: string;
+  content?: string;
+  returnJson?: any;
 }
 
-const massTalkSaveEncodeMap = {};
+const massTalkSaveEncodeMap = {
+  userSeq: 'p_user_seq',
+  deviceType: 'p_device_type',
+  token: 'p_token',
+  content: 'p_content',
+  roomSeq: 'p_room_id'
+};
 
 export const encodeMassTalkSave: APIEncoder<MassTalkSaveRequest> = (
   req: MassTalkSaveRequest
@@ -33,5 +43,21 @@ export const encodeMassTalkSave: APIEncoder<MassTalkSaveRequest> = (
 export const decodeMassTalkSave: APIDecoder<MassTalkSaveResponse> = (
   res: any
 ) => {
-  return {} as MassTalkSaveResponse;
+  try {
+    const json: JsonObject | Error = JsonAnalization.receiveAnalization(res);
+    return {
+      statusCode: json.StatusCode,
+      errorMessage: json.ErrorMessage,
+      content: json.Content,
+      eventMassSeq: json.EventMassSeq,
+      regDate: json.RegDate,
+      roomID: json.RoomID,
+      returnJson: res
+    } as MassTalkSaveResponse;
+  } catch (e) {
+    return {
+      statusCode: StatusCode.Fail,
+      errorMessage: e
+    } as MassTalkSaveResponse;
+  }
 };
diff --git a/projects/ucap-webmessenger-api-common/src/lib/services/common-api.service.ts b/projects/ucap-webmessenger-api-common/src/lib/services/common-api.service.ts
index 7e401ac2..bbd7b547 100644
--- a/projects/ucap-webmessenger-api-common/src/lib/services/common-api.service.ts
+++ b/projects/ucap-webmessenger-api-common/src/lib/services/common-api.service.ts
@@ -134,7 +134,8 @@ export class CommonApiService {
         this.moduleConfig.urls.massTalkDownload,
         {},
         {
-          params: encodeMassTalkDownload(req)
+          params: encodeMassTalkDownload(req),
+          responseType: 'text' as 'json'
         }
       )
       .pipe(map(res => decodeMassTalkDownload(res)));
@@ -148,7 +149,8 @@ export class CommonApiService {
         this.moduleConfig.urls.massTalkSave,
         {},
         {
-          params: encodeMassTalkSave(req)
+          params: encodeMassTalkSave(req),
+          responseType: 'text' as 'json'
         }
       )
       .pipe(map(res => decodeMassTalkSave(res)));
diff --git a/projects/ucap-webmessenger-api/src/lib/types/status-code.type.ts b/projects/ucap-webmessenger-api/src/lib/types/status-code.type.ts
index a5c41a9f..ec9005b5 100644
--- a/projects/ucap-webmessenger-api/src/lib/types/status-code.type.ts
+++ b/projects/ucap-webmessenger-api/src/lib/types/status-code.type.ts
@@ -1,3 +1,4 @@
 export enum StatusCode {
-  Success = '200'
+  Success = '200',
+  Fail = '500'
 }
diff --git a/projects/ucap-webmessenger-api/src/lib/utils/json.util.ts b/projects/ucap-webmessenger-api/src/lib/utils/json.util.ts
new file mode 100644
index 00000000..25f8964a
--- /dev/null
+++ b/projects/ucap-webmessenger-api/src/lib/utils/json.util.ts
@@ -0,0 +1,20 @@
+import { JsonObject } from 'type-fest';
+
+export class JsonAnalization {
+  public static receiveAnalization(jsonStr: string): JsonObject {
+    const startJson = jsonStr.indexOf('{');
+    const endJson = jsonStr.lastIndexOf('}');
+
+    if (startJson >= 0 && startJson < endJson) {
+      jsonStr = jsonStr
+        .substring(startJson, endJson + 1)
+        .replace(/\n"/gi, '"')
+        .replace(/\n}/gi, '}')
+        .replace(/\n/gi, '\\n');
+
+      return JSON.parse(jsonStr);
+    } else {
+      throw new Error('Invalid Json String');
+    }
+  }
+}
diff --git a/projects/ucap-webmessenger-api/src/public-api.ts b/projects/ucap-webmessenger-api/src/public-api.ts
index 145c80d0..1482b72c 100644
--- a/projects/ucap-webmessenger-api/src/public-api.ts
+++ b/projects/ucap-webmessenger-api/src/public-api.ts
@@ -6,5 +6,6 @@ export * from './lib/apis/api';
 
 export * from './lib/types/status-code.type';
 
+export * from './lib/utils/json.util';
 export * from './lib/utils/parameter.util';
 export * from './lib/utils/url.util';
diff --git a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.ts b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.ts
index 3ca24a96..6fb1a60f 100644
--- a/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.ts
+++ b/projects/ucap-webmessenger-app/src/app/layouts/messenger/components/messages.component.ts
@@ -50,6 +50,7 @@ import {
   CreateChatDialogData,
   CreateChatDialogResult
 } from '../dialogs/chat/create-chat.dialog.component';
+import { Maximum_Range } from '@ucap-webmessenger/core';
 
 @Component({
   selector: 'app-layout-messenger-messages',
@@ -184,16 +185,31 @@ export class MessagesComponent implements OnInit, OnDestroy, AfterViewChecked {
   selectContact() {}
 
   onSendMessage(message: string) {
-    this.store.dispatch(
-      EventStore.send({
-        senderSeq: this.loginRes.userSeq,
-        req: {
-          roomSeq: this.roomInfo.roomSeq,
-          eventType: EventType.Character,
-          sentMessage: message
-        }
-      })
-    );
+    if (message.trim().length > Maximum_Range.MassText) {
+      // MASS TEXT
+      this.store.dispatch(
+        EventStore.sendMass({
+          senderSeq: this.loginRes.userSeq,
+          req: {
+            roomSeq: this.roomInfo.roomSeq,
+            eventType: EventType.MassText,
+            // sentMessage: message.replace(/\n/gi, '\r\n')
+            sentMessage: message
+          }
+        })
+      );
+    } else {
+      this.store.dispatch(
+        EventStore.send({
+          senderSeq: this.loginRes.userSeq,
+          req: {
+            roomSeq: this.roomInfo.roomSeq,
+            eventType: EventType.Character,
+            sentMessage: message
+          }
+        })
+      );
+    }
   }
 
   onClickReceiveAlarm() {
diff --git a/projects/ucap-webmessenger-app/src/app/store/messenger/event/actions.ts b/projects/ucap-webmessenger-app/src/app/store/messenger/event/actions.ts
index 69e78390..7ae76dc2 100644
--- a/projects/ucap-webmessenger-app/src/app/store/messenger/event/actions.ts
+++ b/projects/ucap-webmessenger-app/src/app/store/messenger/event/actions.ts
@@ -95,6 +95,22 @@ export const forwardAfterRoomOpen = createAction(
   }>()
 );
 
+export const sendMass = createAction(
+  '[Messenger::Event] Send Mass',
+  props<{ senderSeq: number; req: SendRequest }>()
+);
+export const sendMassSuccess = createAction(
+  '[Messenger::Event] Send Mass Success',
+  props<{
+    senderSeq: number;
+    res: SendResponse;
+  }>()
+);
+export const sendMassFailure = createAction(
+  '[Messenger::Event] Send Mass Failure',
+  props<{ error: any }>()
+);
+
 export const read = createAction(
   '[Messenger::Event] read',
   props<ReadRequest>()
diff --git a/projects/ucap-webmessenger-app/src/app/store/messenger/event/effects.ts b/projects/ucap-webmessenger-app/src/app/store/messenger/event/effects.ts
index 6df3a803..7e928630 100644
--- a/projects/ucap-webmessenger-app/src/app/store/messenger/event/effects.ts
+++ b/projects/ucap-webmessenger-app/src/app/store/messenger/event/effects.ts
@@ -1,3 +1,8 @@
+import {
+  CommonApiService,
+  MassTalkSaveRequest
+} from '@ucap-webmessenger/api-common';
+import { KEY_ENVIRONMENTS_INFO } from './../../../types/environment.type';
 import { Injectable } from '@angular/core';
 
 import { Actions, createEffect, ofType } from '@ngrx/effects';
@@ -25,7 +30,8 @@ import {
   SendResponse,
   ReadResponse,
   DelResponse,
-  CancelResponse
+  CancelResponse,
+  EventType
 } from '@ucap-webmessenger/protocol-event';
 
 import * as ChatStore from '@app/store/messenger/chat';
@@ -54,7 +60,9 @@ import {
   cancelFailure,
   forward,
   forwardFailure,
-  forwardAfterRoomOpen
+  forwardAfterRoomOpen,
+  sendMass,
+  sendMassFailure
 } from './actions';
 import { SessionStorageService } from '@ucap-webmessenger/web-storage';
 import {
@@ -62,9 +70,12 @@ import {
   RoomProtocolService,
   OpenResponse
 } from '@ucap-webmessenger/protocol-room';
-import { LoginInfo, KEY_LOGIN_INFO } from '@app/types';
+import { LoginInfo, KEY_LOGIN_INFO, EnvironmentsInfo } from '@app/types';
 import { Dictionary } from '@ngrx/entity';
 import { openSuccess, openFailure } from '../room';
+import { LoginResponse } from '@ucap-webmessenger/protocol-authentication';
+import { KEY_LOGIN_RES_INFO } from '@app/types/login-res-info.type';
+import { StatusCode } from '@ucap-webmessenger/api';
 
 @Injectable()
 export class Effects {
@@ -289,6 +300,52 @@ export class Effects {
     )
   );
 
+  sendMass$ = createEffect(
+    () => {
+      return this.actions$.pipe(
+        ofType(sendMass),
+        exhaustMap(action => {
+          const loginResInfo: LoginResponse = this.sessionStorageService.get<
+            LoginResponse
+          >(KEY_LOGIN_RES_INFO);
+
+          const environmentsInfo = this.sessionStorageService.get<
+            EnvironmentsInfo
+          >(KEY_ENVIRONMENTS_INFO);
+
+          const req: MassTalkSaveRequest = {
+            userSeq: loginResInfo.userSeq,
+            deviceType: environmentsInfo.deviceType,
+            token: loginResInfo.tokenString,
+            content: action.req.sentMessage,
+            roomSeq: action.req.roomSeq
+          };
+
+          return this.commonApiService.massTalkSave(req).pipe(
+            map(res => {
+              if (res.statusCode === StatusCode.Success) {
+                this.store.dispatch(
+                  send({
+                    senderSeq: action.senderSeq,
+                    req: {
+                      roomSeq: res.roomID,
+                      eventType: EventType.MassText,
+                      sentMessage: res.returnJson
+                    }
+                  })
+                );
+              } else {
+                this.store.dispatch(sendMassFailure({ error: res }));
+              }
+            }),
+            catchError(error => of(sendMassFailure({ error })))
+          );
+        })
+      );
+    },
+    { dispatch: false }
+  );
+
   newInfo$ = createEffect(
     () => {
       return this.actions$.pipe(
@@ -428,6 +485,7 @@ export class Effects {
   constructor(
     private actions$: Actions,
     private store: Store<any>,
+    private commonApiService: CommonApiService,
     private eventProtocolService: EventProtocolService,
     private roomProtocolService: RoomProtocolService,
     private sessionStorageService: SessionStorageService,
diff --git a/projects/ucap-webmessenger-app/src/app/store/messenger/sync/reducers.ts b/projects/ucap-webmessenger-app/src/app/store/messenger/sync/reducers.ts
index 7fe5b51b..71759188 100644
--- a/projects/ucap-webmessenger-app/src/app/store/messenger/sync/reducers.ts
+++ b/projects/ucap-webmessenger-app/src/app/store/messenger/sync/reducers.ts
@@ -1,3 +1,4 @@
+import { JsonObject } from 'type-fest';
 import { createReducer, on } from '@ngrx/store';
 import {
   initialState,
@@ -30,6 +31,7 @@ import * as RoomStore from '@app/store/messenger/room';
 import { RoomInfo } from '@ucap-webmessenger/protocol-room';
 import { EventType } from '@ucap-webmessenger/protocol-event';
 import { FileType } from '@ucap-webmessenger/protocol-file';
+import { JsonAnalization } from '@ucap-webmessenger/api';
 
 export const reducer = createReducer(
   initialState,
@@ -119,6 +121,18 @@ export const reducer = createReducer(
       case EventType.VideoConference:
         finalEventMessage = '화상회의';
         break;
+      case EventType.MassText:
+        {
+          try {
+            const json: JsonObject | Error = JsonAnalization.receiveAnalization(
+              finalEventMessage
+            );
+            finalEventMessage = json.Content.toString();
+          } catch (e) {
+            finalEventMessage = '대용량 텍스트';
+          }
+        }
+        break;
     }
     const roomInfo = {
       ...state.room.entities[action.roomSeq],
diff --git a/projects/ucap-webmessenger-core/src/lib/type/maximum-range.type.ts b/projects/ucap-webmessenger-core/src/lib/type/maximum-range.type.ts
new file mode 100644
index 00000000..ad1c7d03
--- /dev/null
+++ b/projects/ucap-webmessenger-core/src/lib/type/maximum-range.type.ts
@@ -0,0 +1,4 @@
+export enum Maximum_Range {
+  MassText = 800,
+  ChatRoom = 300
+}
diff --git a/projects/ucap-webmessenger-core/src/public-api.ts b/projects/ucap-webmessenger-core/src/public-api.ts
index 879e03a7..e02f3957 100644
--- a/projects/ucap-webmessenger-core/src/public-api.ts
+++ b/projects/ucap-webmessenger-core/src/public-api.ts
@@ -12,6 +12,7 @@ export * from './lib/type/device-devision.type';
 export * from './lib/type/device-type.type';
 export * from './lib/type/file-transfer-permissions.type';
 export * from './lib/type/locale-code.type';
+export * from './lib/type/maximum-range.type';
 export * from './lib/type/notification-method.type';
 export * from './lib/type/organization-chart-permissions.type';
 export * from './lib/type/push-type.type';
diff --git a/projects/ucap-webmessenger-ui-chat/src/lib/components/message-box/mass.component.ts b/projects/ucap-webmessenger-ui-chat/src/lib/components/message-box/mass.component.ts
index 739a3eeb..1a11d3ce 100644
--- a/projects/ucap-webmessenger-ui-chat/src/lib/components/message-box/mass.component.ts
+++ b/projects/ucap-webmessenger-ui-chat/src/lib/components/message-box/mass.component.ts
@@ -3,6 +3,7 @@ import { Info } from '@ucap-webmessenger/protocol-event';
 import { NGXLogger } from 'ngx-logger';
 import { StatusCode } from '@ucap-webmessenger/api';
 import { MassTextInfo } from '../../models/mass-talk-info.json';
+import { StringUtil } from '@ucap-webmessenger/ui';
 
 @Component({
   selector: 'ucap-chat-message-box-mass',
@@ -24,7 +25,9 @@ export class MassComponent implements OnInit {
 
   ngOnInit() {
     try {
-      const contentJson: MassTextInfo = JSON.parse(this.message.sentMessage);
+      const contentJson: MassTextInfo = StringUtil.receiveAnalization(
+        this.message.sentMessage
+      );
       if (contentJson.StatusCode === StatusCode.Success) {
         this.content = contentJson.Content;
       } else {
diff --git a/projects/ucap-webmessenger-ui/src/lib/utils/string.util.ts b/projects/ucap-webmessenger-ui/src/lib/utils/string.util.ts
index c281f032..d8f9f272 100644
--- a/projects/ucap-webmessenger-ui/src/lib/utils/string.util.ts
+++ b/projects/ucap-webmessenger-ui/src/lib/utils/string.util.ts
@@ -1,3 +1,5 @@
+import { JsonObject } from 'type-fest';
+
 export class StringUtil {
   /**
    * linefeed > <br>
@@ -33,6 +35,26 @@ export class StringUtil {
     }
   }
 
+  /**
+   * Json String Analization.
+   */
+  public static receiveAnalization(jsonStr: string): JsonObject {
+    const startJson = jsonStr.indexOf('{');
+    const endJson = jsonStr.lastIndexOf('}');
+
+    if (startJson >= 0 && startJson < endJson) {
+      jsonStr = jsonStr
+        .substring(startJson, endJson + 1)
+        .replace(/\n"/gi, '"')
+        .replace(/\n}/gi, '}')
+        .replace(/\n/gi, '\\n');
+
+      return JSON.parse(jsonStr);
+    } else {
+      throw new Error('Invalid Json String');
+    }
+  }
+
   /**
    * date formater
    */