diff --git a/cosyvoice/bin/export_jit.py b/cosyvoice/bin/export_jit.py
index 8dd6531..5d6b9a8 100644
--- a/cosyvoice/bin/export_jit.py
+++ b/cosyvoice/bin/export_jit.py
@@ -24,9 +24,8 @@ ROOT_DIR = os.path.dirname(os.path.abspath(__file__))
 sys.path.append('{}/../..'.format(ROOT_DIR))
 sys.path.append('{}/../../third_party/Matcha-TTS'.format(ROOT_DIR))
 from cosyvoice.cli.cosyvoice import AutoModel
-from cosyvoice.cli.model import CosyVoiceModel, CosyVoice2Model, CosyVoice3Model
+from cosyvoice.cli.model import CosyVoiceModel, CosyVoice2Model
 from cosyvoice.utils.file_utils import logging
-from cosyvoice.utils.class_utils import get_model_type
 
 
 def get_args():
@@ -61,7 +60,7 @@ def main():
 
     model = AutoModel(model_dir=args.model_dir)
 
-    if get_model_type(model.model) == CosyVoiceModel:
+    if isinstance(model.model, CosyVoiceModel):
         # 1. export llm text_encoder
         llm_text_encoder = model.model.llm.text_encoder
         script = get_optimized_script(llm_text_encoder)
@@ -85,7 +84,7 @@ def main():
         script = get_optimized_script(flow_encoder.half())
         script.save('{}/flow.encoder.fp16.zip'.format(args.model_dir))
         logging.info('successfully export flow_encoder')
-    elif get_model_type(model.model) == CosyVoice2Model:
+    elif isinstance(model.model, CosyVoice2Model):
         # 1. export flow encoder
         flow_encoder = model.model.flow.encoder
         script = get_optimized_script(flow_encoder)
diff --git a/cosyvoice/cli/frontend.py b/cosyvoice/cli/frontend.py
index 0942da6..f0c75dd 100644
--- a/cosyvoice/cli/frontend.py
+++ b/cosyvoice/cli/frontend.py
@@ -20,18 +20,9 @@ import numpy as np
 import whisper
 from typing import Callable
 import torchaudio.compliance.kaldi as kaldi
-import torchaudio
 import os
 import re
 import inflect
-try:
-    import ttsfrd
-    use_ttsfrd = True
-except ImportError:
-    print("failed to import ttsfrd, use wetext instead")
-    from wetext import Normalizer as ZhNormalizer
-    from wetext import Normalizer as EnNormalizer
-    use_ttsfrd = False
 from cosyvoice.utils.file_utils import logging, load_wav
 from cosyvoice.utils.frontend_utils import contains_chinese, replace_blank, replace_corner_mark, remove_bracket, spell_out_number, split_paragraph, is_only_punctuation
 
@@ -60,17 +51,29 @@ class CosyVoiceFrontEnd:
         else:
             self.spk2info = {}
         self.allowed_special = allowed_special
-        self.use_ttsfrd = use_ttsfrd
-        if self.use_ttsfrd:
+        self.inflect_parser = inflect.engine()
+        # NOTE compatible when no text frontend tool is avaliable
+        try:
+            import ttsfrd
             self.frd = ttsfrd.TtsFrontendEngine()
             ROOT_DIR = os.path.dirname(os.path.abspath(__file__))
             assert self.frd.initialize('{}/../../pretrained_models/CosyVoice-ttsfrd/resource'.format(ROOT_DIR)) is True, \
                 'failed to initialize ttsfrd resource'
             self.frd.set_lang_type('pinyinvg')
-        else:
-            self.zh_tn_model = ZhNormalizer(remove_erhua=False)
-            self.en_tn_model = EnNormalizer()
-            self.inflect_parser = inflect.engine()
+            self.text_frontend = 'ttsfrd'
+            logging.info('use ttsfrd frontend')
+        except:
+            try:
+                from wetext import Normalizer as ZhNormalizer
+                from wetext import Normalizer as EnNormalizer
+                self.zh_tn_model = ZhNormalizer(remove_erhua=False)
+                self.en_tn_model = EnNormalizer()
+                self.text_frontend = 'wetext'
+                logging.info('use wetext frontend')
+            except:
+                self.text_frontend = ''
+                logging.info('no frontend is avaliable')
+
 
     def _extract_text_token(self, text):
         if isinstance(text, Generator):
@@ -131,12 +134,13 @@ class CosyVoiceFrontEnd:
         if text_frontend is False or text == '':
             return [text] if split is True else text
         text = text.strip()
-        if self.use_ttsfrd:
+        if self.text_frontend == 'ttsfrd':
             texts = [i["text"] for i in json.loads(self.frd.do_voicegen_frd(text))["sentences"]]
             text = ''.join(texts)
         else:
             if contains_chinese(text):
-                text = self.zh_tn_model.normalize(text)
+                if self.text_frontend == 'wetext':
+                    text = self.zh_tn_model.normalize(text)
                 text = text.replace("\n", "")
                 text = replace_blank(text)
                 text = replace_corner_mark(text)
@@ -147,7 +151,8 @@ class CosyVoiceFrontEnd:
                 texts = list(split_paragraph(text, partial(self.tokenizer.encode, allowed_special=self.allowed_special), "zh", token_max_n=80,
                                              token_min_n=60, merge_len=20, comma_split=False))
             else:
-                text = self.en_tn_model.normalize(text)
+                if self.text_frontend == 'wetext':
+                    text = self.en_tn_model.normalize(text)
                 text = spell_out_number(text, self.inflect_parser)
                 texts = list(split_paragraph(text, partial(self.tokenizer.encode, allowed_special=self.allowed_special), "en", token_max_n=80,
                                              token_min_n=60, merge_len=20, comma_split=False))