diff --git a/README-CN.md b/README-CN.md
index b34d45d..287a4fd 100644
--- a/README-CN.md
+++ b/README-CN.md
@@ -69,6 +69,9 @@ python3 make_book.py --book_name test_books/animal_farm.epub --model deepl --dee
 # Use the Claude model with Japanese
 python3 make_book.py --book_name test_books/animal_farm.epub --model claude --claude_key ${claude_key} --language ja
 
+# Use the CustomAPI model with Japanese
+python3 make_book.py --book_name test_books/animal_farm.epub --model customapi --custom_api ${custom_api} --language ja
+
 # Translate contents in <div> and <p>
 python3 make_book.py --book_name test_books/animal_farm.epub --translate-tags div,p
 
diff --git a/README.md b/README.md
index 75659fb..062060f 100644
--- a/README.md
+++ b/README.md
@@ -87,6 +87,9 @@ python3 make_book.py --book_name test_books/animal_farm.epub --model deepl --dee
 # Use the Claude model with Japanese
 python3 make_book.py --book_name test_books/animal_farm.epub --model claude --claude_key ${claude_key} --language ja
 
+# Use the CustomAPI model with Japanese
+python3 make_book.py --book_name test_books/animal_farm.epub --model customapi --custom_api ${custom_api} --language ja
+
 # Translate contents in <div> and <p>
 python3 make_book.py --book_name test_books/animal_farm.epub --translate-tags div,p
 
diff --git a/book_maker/cli.py b/book_maker/cli.py
index a640fac..739ee94 100644
--- a/book_maker/cli.py
+++ b/book_maker/cli.py
@@ -99,6 +99,13 @@ def main():
         help="you can find claude key from here (https://console.anthropic.com/account/keys)",
     )
 
+    parser.add_argument(
+        "--custom_api",
+        dest="custom_api",
+        type=str,
+        help="you should build your own translation api",
+    )
+
     parser.add_argument(
         "--test",
         dest="test",
@@ -296,6 +303,10 @@ So you are close to reaching the limit. You have to choose your own value, there
         API_KEY = options.claude_key or env.get("BBM_CLAUDE_API_KEY")
         if not API_KEY:
             raise Exception("Please provide claude key")
+    elif options.model == "customapi":
+        API_KEY = options.custom_api or env.get("BBM_CUSTOM_API")
+        if not API_KEY:
+            raise Exception("Please provide custom translate api")
     else:
         API_KEY = ""
 
diff --git a/book_maker/translator/__init__.py b/book_maker/translator/__init__.py
index d3ae3d8..ecefe48 100644
--- a/book_maker/translator/__init__.py
+++ b/book_maker/translator/__init__.py
@@ -6,6 +6,7 @@ from book_maker.translator.google_translator import Google
 from book_maker.translator.gpt3_translator import GPT3
 from book_maker.translator.gpt4_translator import GPT4
 from book_maker.translator.claude_translator import Claude
+from book_maker.translator.custom_api_translator import CustomAPI
 
 MODEL_DICT = {
     "chatgptapi": ChatGPTAPI,
@@ -16,5 +17,6 @@ MODEL_DICT = {
     "deeplfree": DeepLFree,
     "gpt4": GPT4,
     "claude": Claude,
+    "customapi": CustomAPI
     # add more here
 }
diff --git a/book_maker/translator/custom_api_translator.py b/book_maker/translator/custom_api_translator.py
new file mode 100644
index 0000000..a67d497
--- /dev/null
+++ b/book_maker/translator/custom_api_translator.py
@@ -0,0 +1,31 @@
+from .base_translator import Base
+import re
+import json
+import requests
+import time
+from rich import print
+
+
+class CustomAPI(Base):
+    """
+    Custom API translator
+    """
+
+    def __init__(self, custom_api, language, **kwargs) -> None:
+        super().__init__(custom_api, language)
+        self.language = language
+        self.custom_api = custom_api
+
+    def rotate_key(self):
+        pass
+
+    def translate(self, text):
+        print(text)
+        custom_api = self.custom_api
+        data = {"text": text, "source_lang": self.language, "target_lang": "auto"}
+        post_data = json.dumps(data)
+        r = requests.post(url=custom_api, data=post_data, timeout=10).text
+        t_text = json.loads(r)["data"]
+        print("[bold green]" + re.sub("\n{3,}", "\n\n", t_text) + "[/bold green]")
+        time.sleep(5)
+        return t_text
diff --git a/docs/model_lang.md b/docs/model_lang.md
index f3b844e..5974ffe 100644
--- a/docs/model_lang.md
+++ b/docs/model_lang.md
@@ -2,7 +2,7 @@
 ## Models
 `-m, --model <Model>` <br>
 
-Currently `bbook_maker` supports these models: `chatgptapi` , `gpt3` , `google` , `caiyun` , `deepl` , `deeplfree` , `gpt4` , `claude` .
+Currently `bbook_maker` supports these models: `chatgptapi` , `gpt3` , `google` , `caiyun` , `deepl` , `deeplfree` , `gpt4` , `claude` , `customapi`.
 Default model is `chatgptapi` . 
 
 ### OPENAI models
@@ -95,7 +95,11 @@ Support [Claude](https://console.anthropic.com/docs) model. Use `--model claude
 
     bbook_maker --book_name test_books/animal_farm.epub --model claude --claude_key ${claude_key}
             
-            
+
+### Custom API
+Support CustomAPI model. Use `--model customapi --custom_api ${custom_api}` .
+
+    bbook_maker --book_name test_books/animal_farm.epub --model customapi --custom_api ${custom_api}  
 
 ### Google