diff --git a/app/app.py b/app/app.py
index 6738235..74c3f83 100644
--- a/app/app.py
+++ b/app/app.py
@@ -1,22 +1,94 @@
-from flask import Flask, render_template, request, jsonify
+# -*- coding: utf-8 -*-
+import os
+from flask import Flask, request, jsonify
 import ctranslate2
 import sentencepiece as spm
-from config import ct_model_path, sp_model_path, device
+
 
 
 app = Flask(__name__)
 
-# 加载模型
-sp = spm.SentencePieceProcessor()
-sp.load(sp_model_path)
-translator = ctranslate2.Translator(ct_model_path, device)
 
 @app.route('/')
 def index():
-    return render_template('index.html')
+    model_1 = "./nllb/nllb-200-600M-int8"
+    model_2 = "./nllb/nllb-200-1.2B-int8"
+    model_3 = "./nllb/nllb-200-3.3B-int8"
+    sp_model = "./nllb/flores200_sacrebleu_tokenizer_spm.model"
+    exist_1 = os.path.isdir(model_1)
+    exist_2 = os.path.isdir(model_2)
+    exist_3 = os.path.isdir(model_3)
+    exist_sp = os.path.isfile(sp_model)
+
+    if exist_1 is True and exist_sp is True:
+        return jsonify({"Status": "OK"})
+    elif exist_2 is True and exist_sp is True:
+        return jsonify({"Status": "OK"})
+    if exist_3 is True and exist_sp is True:
+        return jsonify({"Status": "OK"})
+    else:
+        return jsonify(
+            {
+                "Status": "Service is not running correctly, please check the NLLB file"
+            }
+        )
+
+
+@app.route('/help', methods=['GET'])
+def help():
+    return jsonify(
+        {"Language_code": [
+                {"English": "eng_Latn"},
+                {"Chinese Simplified": "zho_Hans"},
+                {"Chinese Traditional": "zho_Hant"},
+                {"Estonian": "est_Latn"},
+                {"Finnish": "fin_Latn"},
+                {"French": "fra_Latn"},
+                {"Hindi": "hin_Deva"},
+                {"Romanian": "ron_Latn"},
+                {"Latvian": "lvs_Latn"},
+                {"Russian": "rus_Cyrl"},
+                {"Spanish": "spa_Latn"},
+                {"Turkish": "tur_Latn"},
+                {"Kinyarwanda": "kin_Latn"}
+            ]
+        }
+    )
+
 
 @app.route('/translate', methods=['POST'])
 def translate_text():
+    device = "cpu"
+    translator = None
+    sp = spm.SentencePieceProcessor()
+
+    model_1 = "./nllb/nllb-200-600M-int8"
+    model_2 = "./nllb/nllb-200-1.2B-int8"
+    model_3 = "./nllb/nllb-200-3.3B-int8"
+    sp_model = "./nllb/flores200_sacrebleu_tokenizer_spm.model"
+    exist_1 = os.path.isdir(model_1)
+    exist_2 = os.path.isdir(model_2)
+    exist_3 = os.path.isdir(model_3)
+    exist_sp = os.path.isfile(sp_model)
+
+    if exist_1 is True and exist_sp is True:
+        sp.load(sp_model)
+        translator = ctranslate2.Translator(model_1, device)
+
+    elif exist_2 is True and exist_sp is True:
+        sp.load(sp_model)
+        translator = ctranslate2.Translator(model_2, device)
+
+    elif exist_3 is True and exist_sp is True:
+        sp.load(sp_model)
+        translator = ctranslate2.Translator(model_3, device)
+    else:
+        return jsonify(
+            {
+                "Status": "Service is not running correctly, please check the NLLB file"
+            }
+        )
+
     data = request.get_json()
     source_text = data['source_text']
     src_lang = data['src_lang']
@@ -26,22 +98,25 @@ def translate_text():
     source_sentences = source_text.split('\n')
     source_sentences = [sent.strip() for sent in source_sentences]
 
-    # 使用 SentencePiece
+    # use SentencePiece
+    target_prefix = [[tgt_lang]] * len(source_sentences)
+    # Subword the source sentences
     source_sents_subworded = sp.encode_as_pieces(source_sentences)
     source_sents_subworded = [[src_lang] + sent + ["</s>"] for sent in source_sents_subworded]
-
-    # translate
-    target_prefix = [[tgt_lang]] * len(source_sentences)
-    translations_subworded = translator.translate_batch(source_sents_subworded, batch_type="tokens", max_batch_size=2024, beam_size=4, target_prefix=target_prefix)
+    # Translate the source sentences
+    translations_subworded = translator.translate_batch(source_sents_subworded, batch_type="tokens",
+                                                        max_batch_size=2024, beam_size=4,
+                                                        target_prefix=target_prefix)
     translations_subworded = [translation.hypotheses[0] for translation in translations_subworded]
+    for translation in translations_subworded:
+        if tgt_lang in translation:
+            translation.remove(tgt_lang)
+    # De-subword the target sentences
+    translations = sp.decode(translations_subworded)
+    translation = "".join(translations)
 
-    # back to words
-    translated_texts = sp.decode(translations_subworded)
-    translated_text = '\n'.join(translated_texts)
-    print(translated_text)
-
-    return jsonify({'translation': translated_text})
+    return jsonify({'translation': translation})
 
 
 if __name__ == "__main__":
-    app.run(host='0.0.0.0', port=5000)
\ No newline at end of file
+    app.run(host='127.0.0.1', port=8080)