diff --git a/paddlespeech/t2s/assets/sentences_mix.txt b/paddlespeech/t2s/assets/sentences_mix.txt
index 06e97d14a..bfa0db636 100644
--- a/paddlespeech/t2s/assets/sentences_mix.txt
+++ b/paddlespeech/t2s/assets/sentences_mix.txt
@@ -5,4 +5,5 @@
 005 Paddle Bo Bo: 使用 Paddle Speech 的语音合成模块生成虚拟人的声音。
 006 热烈欢迎您在 Discussions 中提交问题，并在 Issues 中指出发现的 bug。此外，我们非常希望您参与到 Paddle Speech 的开发中！
 007 我喜欢 eat apple, 你喜欢 drink milk。
-008 我们要去云南 team building, 非常非常 happy.
\ No newline at end of file
+008 我们要去云南 team building, 非常非常 happy.
+009 AI for Sceience 平台。
\ No newline at end of file
diff --git a/paddlespeech/t2s/frontend/phonectic.py b/paddlespeech/t2s/frontend/phonectic.py
index b3f64dc52..d6c66f1e0 100644
--- a/paddlespeech/t2s/frontend/phonectic.py
+++ b/paddlespeech/t2s/frontend/phonectic.py
@@ -47,10 +47,29 @@ class Phonetics(ABC):
 
 class English(Phonetics):
     """ Normalize the input text sequence and convert into pronunciation id sequence.
+
+    https://github.com/Kyubyong/g2p/blob/master/g2p_en/g2p.py
+
+    phonemes = ["<pad>", "<unk>", "<s>", "</s>"] + [   
+        'AA0', 'AA1', 'AA2', 'AE0', 'AE1', 'AE2', 'AH0', 'AH1', 'AH2', 'AO0',
+        'AO1', 'AO2', 'AW0', 'AW1', 'AW2', 'AY0', 'AY1', 'AY2', 'B', 'CH', 'D', 'DH',
+        'EH0', 'EH1', 'EH2', 'ER0', 'ER1', 'ER2', 'EY0', 'EY1',
+        'EY2', 'F', 'G', 'HH',
+        'IH0', 'IH1', 'IH2', 'IY0', 'IY1', 'IY2', 'JH', 'K', 'L',
+        'M', 'N', 'NG', 'OW0', 'OW1',
+        'OW2', 'OY0', 'OY1', 'OY2', 'P', 'R', 'S', 'SH', 'T', 'TH',
+        'UH0', 'UH1', 'UH2', 'UW',
+        'UW0', 'UW1', 'UW2', 'V', 'W', 'Y', 'Z', 'ZH']
     """
 
+    LEXICON = {
+        # key using lowercase
+        "AI".lower(): [["EY0", "AY1"]],
+    }
+
     def __init__(self, phone_vocab_path=None):
         self.backend = G2p()
+        self.backend.cmu.update(English.LEXICON)
         self.phonemes = list(self.backend.phonemes)
         self.punctuations = get_punctuations("en")
         self.vocab = Vocab(self.phonemes + self.punctuations)
diff --git a/tests/unit/tts/test_mixfrontend.py b/tests/unit/tts/test_mixfrontend.py
index 24167338f..5751dd2a7 100644
--- a/tests/unit/tts/test_mixfrontend.py
+++ b/tests/unit/tts/test_mixfrontend.py
@@ -1,3 +1,16 @@
+# Copyright (c) 2023 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
 import re
 import tempfile
 
diff --git a/tests/unit/tts/test_ssml.py b/tests/unit/tts/test_ssml.py
index 382558a4f..2c2401837 100644
--- a/tests/unit/tts/test_ssml.py
+++ b/tests/unit/tts/test_ssml.py
@@ -1,3 +1,16 @@
+# Copyright (c) 2023 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
 from paddlespeech.t2s.frontend.ssml.xml_processor import MixTextProcessor
 
 if __name__ == '__main__':