diff --git a/src/components/chat/InputBox.vue b/src/components/chat/InputBox.vue
index 99beb0a..2f141bc 100644
--- a/src/components/chat/InputBox.vue
+++ b/src/components/chat/InputBox.vue
@@ -1,6 +1,12 @@
 <template>
   <div class="input-box">
-    <el-input v-model="value" :rows="2" type="textarea" placeholder="Please input" />
+    <el-input
+      v-model="value"
+      :rows="2"
+      type="textarea"
+      placeholder="Please input"
+      @keydown.enter.exact.prevent="onSubmit"
+    />
   </div>
 </template>
 
@@ -23,7 +29,7 @@ export default defineComponent({
       required: true
     }
   },
-  emits: ['update:modelValue'],
+  emits: ['update:modelValue', 'submit'],
   data() {
     return {
       value: this.modelValue
@@ -38,6 +44,11 @@ export default defineComponent({
         this.value = val;
       }
     }
+  },
+  methods: {
+    onSubmit() {
+      this.$emit('submit', this.value);
+    }
   }
 });
 </script>
diff --git a/src/components/chat/Message.vue b/src/components/chat/Message.vue
index 32d9754..abe12c8 100644
--- a/src/components/chat/Message.vue
+++ b/src/components/chat/Message.vue
@@ -14,6 +14,7 @@ import { ElImage, ElButton } from 'element-plus';
 import { FontAwesomeIcon } from '@fortawesome/vue-fontawesome';
 import copy from 'copy-to-clipboard';
 import MarkdownRenderer from '@/components/common/MarkdownRenderer.vue';
+import { IChatMessage } from '@/operators';
 
 interface IData {
   copied: boolean;
@@ -31,7 +32,7 @@ export default defineComponent({
   },
   props: {
     message: {
-      type: Object as () => IMessage,
+      type: Object as () => IChatMessage,
       required: true
     }
   },
diff --git a/src/operators/chat/constants.ts b/src/operators/chat/constants.ts
new file mode 100644
index 0000000..948a6f7
--- /dev/null
+++ b/src/operators/chat/constants.ts
@@ -0,0 +1,5 @@
+export const API_ID_CHATGPT = '3333';
+export const API_ID_CHATGPT4 = '3333';
+export const API_ID_CHATGPT_BROWSING = '3333';
+export const API_ID_CHATGPT4_BROWSING = '3333';
+export const API_ID_CHATGPT_16k = '3333';
diff --git a/src/operators/chat/index.ts b/src/operators/chat/index.ts
new file mode 100644
index 0000000..4a6cbae
--- /dev/null
+++ b/src/operators/chat/index.ts
@@ -0,0 +1,2 @@
+export * from './models';
+export * from './operator';
diff --git a/src/operators/chat/models.ts b/src/operators/chat/models.ts
new file mode 100644
index 0000000..66f8c96
--- /dev/null
+++ b/src/operators/chat/models.ts
@@ -0,0 +1,52 @@
+export interface IError {
+  code: string;
+  detail?: string;
+}
+
+export enum ChatMessageState {
+  PENDING = 'pending',
+  ANSWERING = 'answering',
+  FINISHED = 'finished',
+  FAILED = 'failed'
+}
+
+export const ROLE_SYSTEM = 'system';
+export const ROLE_ASSISTANT = 'assistant';
+export const ROLE_USER = 'user';
+
+export interface IChatMessage {
+  state?: ChatMessageState;
+  content: string;
+  role?: typeof ROLE_SYSTEM | typeof ROLE_ASSISTANT | typeof ROLE_USER;
+  error?: IError;
+}
+
+export const CHAT_MODEL_CHATGPT = 'chatgpt';
+export const CHAT_MODEL_CHATGPT4 = 'chatgpt4';
+export const CHAT_MODEL_CHATGPT_16K = 'chatgpt-16k';
+export const CHAT_MODEL_CHATGPT_BROWSING = 'chatgpt-browsing';
+export const CHAT_MODEL_CHATGPT4_BROWSING = 'chatgpt4-browsing';
+
+export type IChatModel =
+  | typeof CHAT_MODEL_CHATGPT
+  | typeof CHAT_MODEL_CHATGPT4
+  | typeof CHAT_MODEL_CHATGPT_16K
+  | typeof CHAT_MODEL_CHATGPT_BROWSING
+  | typeof CHAT_MODEL_CHATGPT4_BROWSING;
+
+export interface IChatRequest {
+  question: string;
+  stateful?: boolean;
+  conversation_id?: string;
+}
+
+export interface IChatResponse {
+  answer: string;
+  delta_answer: string;
+  conversation_id?: string;
+}
+
+export interface IChatOptions {
+  stream?: (response: IChatResponse) => void;
+  api_id: string;
+}
diff --git a/src/operators/chat/operator.ts b/src/operators/chat/operator.ts
new file mode 100644
index 0000000..dce3d2e
--- /dev/null
+++ b/src/operators/chat/operator.ts
@@ -0,0 +1,40 @@
+import axios, { AxiosResponse, AxiosRequestConfig } from 'axios';
+import { IChatOptions, IChatRequest, IChatResponse } from './models';
+import store from '@/store';
+import { IApplication } from '@/store/models';
+class ChatOperator {
+  async request(data: IChatRequest, config?: IChatOptions): Promise<AxiosResponse<IChatResponse>> {
+    const applications: IApplication[] = store.getters.applications;
+    // find related application
+    const application = applications?.filter((application: IApplication) => {
+      return (application.api_id = config?.api_id);
+    })?.[0];
+    if (!application) {
+      return Promise.reject('no application');
+    }
+    const token = application?.credential?.token;
+    if (!token) {
+      return Promise.reject('no token');
+    }
+    return await axios.post(`/chatgpt`, data, {
+      headers: {
+        authorization: `Bearer ${token}`,
+        accept: 'application/x-ndjson',
+        'content-type': 'application/json'
+      },
+      onDownloadProgress: (event) => {
+        const response = event.target.response;
+        const lines = response.split('\r\n').filter((line: string) => !!line);
+        const lastLine = lines[lines.length - 1];
+        if (lastLine) {
+          const jsonData = JSON.parse(lastLine);
+          if (config?.stream) {
+            config?.stream(jsonData as IChatResponse);
+          }
+        }
+      }
+    });
+  }
+}
+
+export const chatOperator = new ChatOperator();
diff --git a/src/operators/index.ts b/src/operators/index.ts
index cbcf3b4..0391628 100644
--- a/src/operators/index.ts
+++ b/src/operators/index.ts
@@ -2,3 +2,4 @@ export * from './instance';
 export * from './application';
 export * from './user';
 export * from './api';
+export * from './chat';
diff --git a/src/pages/chat/Conversation.vue b/src/pages/chat/Conversation.vue
index f7a4339..6784f19 100644
--- a/src/pages/chat/Conversation.vue
+++ b/src/pages/chat/Conversation.vue
@@ -1,29 +1,47 @@
 <template>
   <div class="page">
-    <div v-for="(message, messageIndex) in messages" :key="messageIndex">
-      <message :message="message" class="message" />
+    <model-selector v-model="model" class="model-selector" />
+    <div class="main">
+      <introduction v-if="messages && messages.length === 0" />
+      <div v-else class="messages">
+        <div v-for="(message, messageIndex) in messages" :key="messageIndex">
+          <message :message="message" class="message" />
+        </div>
+      </div>
+    </div>
+    <div class="bottom">
+      <input-box v-model="question" @submit="onSubmitQuestion" />
     </div>
   </div>
 </template>
 
 <script lang="ts">
-import { IMessage, ROLE_ASSISTANT, ROLE_SYSTEM, ROLE_USER } from '@/operators/message/models';
+import { IMessage, ROLE_ASSISTANT, ROLE_USER } from '@/operators/message/models';
 import { defineComponent } from 'vue';
 import Message from '@/components/chat/Message.vue';
+import { IChatModel, IChatMessage, CHAT_MODEL_CHATGPT, IChatResponse } from '@/operators';
+import InputBox from '@/components/chat/InputBox.vue';
+import ModelSelector from '@/components/chat/ModelSelector.vue';
+import { chatOperator } from '@/operators';
+
 export interface IData {
-  messages: IMessage[];
+  messages: IChatMessage[];
+  model: IChatModel;
+  question: '';
 }
 
 export default defineComponent({
   name: 'ChatConversation',
   components: {
     // Introduction,
-    // InputBox,
-    // ModelSelector,
+    InputBox,
+    ModelSelector,
     Message
   },
   data(): IData {
     return {
+      question: '',
+      model: CHAT_MODEL_CHATGPT,
       messages: [
         {
           role: ROLE_USER,
@@ -31,19 +49,94 @@ export default defineComponent({
         },
         {
           role: ROLE_ASSISTANT,
-          content: 'hello, how can I assist you?'
+          content: '## ok \n\n hello, how can I assist you? \n ```python\nprint("hello")\n```'
+        },
+        {
+          role: ROLE_USER,
+          content: 'hello'
+        },
+        {
+          role: ROLE_ASSISTANT,
+          content: '## ok \n\n hello, how can I assist you? \n ```python\nprint("hello")\n```'
+        },
+        {
+          role: ROLE_USER,
+          content: 'hello'
+        },
+        {
+          role: ROLE_ASSISTANT,
+          content: '## ok \n\n hello, how can I assist you? \n ```python\nprint("hello")\n```'
+        },
+        {
+          role: ROLE_USER,
+          content: 'hello'
+        },
+        {
+          role: ROLE_ASSISTANT,
+          content: '## ok \n\n hello, how can I assist you? \n ```python\nprint("hello")\n```'
+        },
+        {
+          role: ROLE_USER,
+          content: 'hello'
+        },
+        {
+          role: ROLE_ASSISTANT,
+          content: '## ok \n\n hello, how can I assist you? \n ```python\nprint("hello")\n```'
         }
       ]
     };
+  },
+  computed: {
+    conversationId(): string | undefined {
+      return this.$route.params.id?.toString();
+    }
+  },
+  methods: {
+    onSubmitQuestion() {
+      this.messages.push({
+        content: this.question,
+        role: ROLE_USER
+      });
+      this.question = '';
+    },
+    async onFetchAnswer() {
+      const apiId = this.model;
+      const { data: response }: IChatResponse = await chatOperator.request(
+        {
+          question: this.question,
+          conversation_id: this.conversationId,
+          stateful: true
+        },
+        {
+          api_id: apiId,
+          stream: (response: IChatResponse) => {
+            console.log('response', response);
+          }
+        }
+      );
+      console.log('this.response', response);
+    }
   }
 });
 </script>
 
 <style lang="scss" scoped>
 .page {
-  padding: 20px;
-  .message {
-    margin-bottom: 10px;
+  padding: 15px;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  width: 100%;
+  height: 100%;
+  .main {
+    flex: 1;
+    width: 100%;
+    overflow-y: scroll;
+    padding: 15px 0;
+  }
+  .bottom {
+    width: 100%;
+    height: 70px;
   }
 }
 </style>
diff --git a/src/store/index.ts b/src/store/index.ts
index 3265cbc..f8dda98 100644
--- a/src/store/index.ts
+++ b/src/store/index.ts
@@ -2,45 +2,47 @@ import { createStore, ActionContext } from 'vuex';
 import createPersistedState from 'vuex-persistedstate';
 import { removeCookies } from '@/utils/cookie';
 import { ENDPOINT } from '@/constants';
-
-export interface ISetting {
-  stream?: boolean;
-  endpoint?: string;
-}
-
-export interface IState {
-  accessToken: string | undefined;
-  setting: ISetting;
-}
+import { IApplication } from '@/operators';
+import { ISetting, IState, IToken } from './models';
 
 const store = createStore({
   state(): IState {
     return {
-      accessToken: undefined,
+      token: {
+        access: undefined,
+        refresh: undefined
+      },
       setting: {
         endpoint: ENDPOINT,
         stream: false
-      }
+      },
+      applications: []
     };
   },
   mutations: {
-    setAccessToken(state: IState, payload: string): void {
-      state.accessToken = payload;
+    setToken(state: IState, payload: IToken): void {
+      state.token = {
+        ...state.token,
+        ...payload
+      };
     },
     setSetting(state: IState, payload: ISetting): void {
       state.setting = {
         ...state.setting,
         ...payload
       };
+    },
+    setApplications(state: IState, payload: IApplication[]): void {
+      state.applications = payload;
     }
   },
   actions: {
-    resetAuth({ commit }) {
-      commit('setAccessToken', undefined);
+    resetToken({ commit }) {
+      commit('setToken', {});
       removeCookies();
     },
-    setAccessToken({ commit }: ActionContext<IState, IState>, payload: string) {
-      commit('setAccessToken', payload);
+    setToken({ commit }: ActionContext<IState, IState>, payload: IToken) {
+      commit('setToken', payload);
     },
     setSetting({ commit }: ActionContext<IState, IState>, payload: ISetting) {
       commit('setSetting', payload);
@@ -48,13 +50,16 @@ const store = createStore({
   },
   getters: {
     authenticated(state): boolean {
-      return !!state.accessToken;
+      return !!state.token.access;
     },
-    accessToken(state): string | undefined {
-      return state.accessToken;
+    token(state): IToken {
+      return state.token;
     },
     setting(state): ISetting | undefined {
       return state.setting;
+    },
+    applications(state): IApplication[] | undefined {
+      return state.applications;
     }
   },
   plugins: [createPersistedState()]
diff --git a/src/store/models.ts b/src/store/models.ts
new file mode 100644
index 0000000..79c65f7
--- /dev/null
+++ b/src/store/models.ts
@@ -0,0 +1,49 @@
+export interface IToken {
+  access?: string;
+  refresh?: string;
+}
+
+export interface ISetting {
+  stream?: boolean;
+  endpoint?: string;
+}
+
+export enum IApplicationType {
+  API = 'Api',
+  PROXY = 'Proxy'
+}
+
+export enum ICredentialType {
+  TOKEN = 'Token',
+  IDENTITY = 'Identity'
+}
+
+export interface ICredential {
+  type: ICredentialType;
+  name?: string;
+  token?: string;
+  username?: string;
+  password?: string;
+  created_at?: string;
+  updated_at?: string;
+}
+
+export interface IApplication {
+  id?: string;
+  type?: IApplicationType;
+  api_id?: string;
+  proxy_id?: string;
+  api_key?: string;
+  user_id?: string;
+  remaining_amount?: number;
+  used_amount?: number;
+  credential?: ICredential;
+  created_at?: string;
+  updated_at?: string;
+}
+
+export interface IState {
+  token: IToken;
+  setting: ISetting;
+  applications: IApplication[];
+}