diff --git a/mkgui/app.py b/mkgui/app.py
index 5e681ef..0f77006 100644
--- a/mkgui/app.py
+++ b/mkgui/app.py
@@ -86,7 +86,7 @@ class Output(BaseModel):
         streamlit_app.pyplot(fig)
 
 
-def main(input: Input) -> Output:
+def synthesize(input: Input) -> Output:
     """synthesize(合成)"""
     # load models
     encoder.load_model(Path(input.encoder.value))
diff --git a/mkgui/app_vc.py b/mkgui/app_vc.py
index 8f55a9c..707f87a 100644
--- a/mkgui/app_vc.py
+++ b/mkgui/app_vc.py
@@ -101,7 +101,7 @@ class Output(BaseModel):
         ax.set_title("mel spectrogram(Result Audio)")
         streamlit_app.pyplot(fig)
 
-def main(input: Input) -> Output:
+def convert(input: Input) -> Output:
     """convert(转换)"""
     # load models
     extractor = Extractor.load_model(Path(input.extractor.value))
diff --git a/mkgui/base/components/types.py b/mkgui/base/components/types.py
index e18e267..125809a 100644
--- a/mkgui/base/components/types.py
+++ b/mkgui/base/components/types.py
@@ -1,5 +1,5 @@
 import base64
-from typing import Any, Dict
+from typing import Any, Dict, overload
 
 
 class FileContent(str):
@@ -27,3 +27,20 @@ class FileContent(str):
             return FileContent(base64.b64encode(value).decode())
         else:
             raise Exception("Wrong type")
+
+# # 暂时无法使用，因为浏览器中没有考虑选择文件夹
+# class DirectoryContent(FileContent):
+#     @classmethod
+#     def __modify_schema__(cls, field_schema: Dict[str, Any]) -> None:
+#         field_schema.update(format="path")
+
+#     @classmethod
+#     def validate(cls, value: Any) -> "DirectoryContent":
+#         if isinstance(value, DirectoryContent):
+#             return value
+#         elif isinstance(value, str):
+#             return DirectoryContent(value)
+#         elif isinstance(value, (bytes, bytearray, memoryview)):
+#             return DirectoryContent(base64.b64encode(value).decode())
+#         else:
+#             raise Exception("Wrong type")
diff --git a/mkgui/base/core.py b/mkgui/base/core.py
index fe7ed50..8166a33 100644
--- a/mkgui/base/core.py
+++ b/mkgui/base/core.py
@@ -112,7 +112,6 @@ class Opyrator:
         else:
             self.function = func
 
-        self._name = "Opyrator"
         self._action = "Execute"
         self._input_type = None
         self._output_type = None
diff --git a/mkgui/base/ui/schema_utils.py b/mkgui/base/ui/schema_utils.py
index 4e2e0b8..a2be43c 100644
--- a/mkgui/base/ui/schema_utils.py
+++ b/mkgui/base/ui/schema_utils.py
@@ -38,6 +38,11 @@ def is_single_file_property(property: Dict) -> bool:
     return property.get("format") == "byte"
 
 
+def is_single_directory_property(property: Dict) -> bool:
+    if property.get("type") != "string":
+        return False
+    return property.get("format") == "path"
+
 def is_multi_enum_property(property: Dict, references: Dict) -> bool:
     if property.get("type") != "array":
         return False
diff --git a/mkgui/base/ui/streamlit_ui.py b/mkgui/base/ui/streamlit_ui.py
index 9708668..08232f7 100644
--- a/mkgui/base/ui/streamlit_ui.py
+++ b/mkgui/base/ui/streamlit_ui.py
@@ -110,7 +110,7 @@ class InputUI:
             # The rendering also returns the current state of input data
             self._session_state.input_data = self._input_class.render_input_ui(  # type: ignore
                 st, self._session_state.input_data
-            ).dict()
+            )
             return
 
         # print(self._schema_properties)
@@ -802,25 +802,31 @@ class OutputUI:
 
 def getOpyrator(mode: str) -> Opyrator:
     if mode == None or mode.startswith('VC'):
-        from mkgui.app_vc import main
-        return  Opyrator(main)
-    from mkgui.app import main
-    return Opyrator(main)
+        from mkgui.app_vc import convert
+        return  Opyrator(convert)
+    if mode == None or mode.startswith('预处理'):
+        from mkgui.preprocess import preprocess
+        return  Opyrator(preprocess)
+    from mkgui.app import synthesize
+    return Opyrator(synthesize)
     
 
 def render_streamlit_ui() -> None:
     # init
     session_state = st.session_state
     session_state.input_data = {}
-    session_state.mode = None
 
     with st.spinner("Loading MockingBird GUI. Please wait..."):
         session_state.mode = st.sidebar.selectbox(
             '模式选择', 
-            ("AI拟音", "VC拟音")
+            ( "AI拟音", "VC拟音", "预处理")
         )
-        opyrator = getOpyrator(session_state.mode)
-    title = opyrator.name
+        if "mode" in session_state:
+            mode = session_state.mode
+        else:
+            mode = ""
+        opyrator = getOpyrator(mode)
+    title = opyrator.name + mode
 
     col1, col2, _ = st.columns(3)
     col2.title(title)
diff --git a/mkgui/preprocess.py b/mkgui/preprocess.py
new file mode 100644
index 0000000..0827add
--- /dev/null
+++ b/mkgui/preprocess.py
@@ -0,0 +1,91 @@
+from pydantic import BaseModel, Field
+import os
+from pathlib import Path
+from enum import Enum
+from typing import Any
+
+
+# Constants
+EXT_MODELS_DIRT = "ppg_extractor\\saved_models"
+ENC_MODELS_DIRT = "encoder\\saved_models"
+
+
+if os.path.isdir(EXT_MODELS_DIRT):    
+    extractors =  Enum('extractors', list((file.name, file) for file in Path(EXT_MODELS_DIRT).glob("**/*.pt")))
+    print("Loaded extractor models: " + str(len(extractors)))
+if os.path.isdir(ENC_MODELS_DIRT):    
+    encoders = Enum('encoders', list((file.name, file) for file in Path(ENC_MODELS_DIRT).glob("**/*.pt")))
+    print("Loaded encoders models: " + str(len(encoders)))
+
+class Model(str, Enum):
+    VC_PPG2MEL = "ppg2mel"
+
+class Dataset(str, Enum):
+    AIDATATANG_200ZH = "aidatatang_200zh"
+    AIDATATANG_200ZH_S = "aidatatang_200zh_s"
+
+class Input(BaseModel):
+    # def render_input_ui(st, input) -> Dict: 
+    #     input["selected_dataset"] = st.selectbox(
+    #         '选择数据集', 
+    #         ("aidatatang_200zh", "aidatatang_200zh_s")
+    #     )
+    # return input
+    model: Model = Field(
+        Model.VC_PPG2MEL, title="目标模型",
+    )
+    dataset: Dataset = Field(
+        Dataset.AIDATATANG_200ZH, title="数据集选择",
+    )
+    datasets_root: str = Field(
+        ..., alias="数据集根目录", description="输入数据集根目录（相对/绝对）",
+        format=True,
+        example="..\\trainning_data\\"
+    )
+    output_root: str = Field(
+        ..., alias="输出根目录", description="输出结果根目录（相对/绝对）",
+        format=True,
+        example="..\\trainning_data\\"
+    )
+    n_processes: int = Field(   
+        2, alias="处理线程数", description="根据CPU线程数来设置",
+        le=32, ge=1
+    )
+    extractor: extractors = Field(
+        ..., alias="特征提取模型", 
+        description="选择PPG特征提取模型文件."
+    )
+    encoder: encoders = Field(
+        ..., alias="语音编码模型", 
+        description="选择语音编码模型文件."
+    )
+
+class AudioEntity(BaseModel):
+    content: bytes
+    mel: Any
+
+class Output(BaseModel):
+    __root__: tuple[str, int]
+
+    def render_output_ui(self, streamlit_app, input) -> None:  # type: ignore
+        """Custom output UI.
+        If this method is implmeneted, it will be used instead of the default Output UI renderer.
+        """
+        sr, count = self.__root__
+        streamlit_app.subheader(f"Dataset {sr} done processed total of {count}")
+
+def preprocess(input: Input) -> Output:
+    """Preprocess(预处理)"""
+    finished = 0
+    if input.model == Model.VC_PPG2MEL:
+        from ppg2mel.preprocess import preprocess_dataset
+        finished = preprocess_dataset(
+            datasets_root=Path(input.datasets_root),
+            dataset=input.dataset,
+            out_dir=Path(input.output_root),
+            n_processes=input.n_processes,
+            ppg_encoder_model_fpath=Path(input.extractor.value),
+            speaker_encoder_model=Path(input.encoder.value)
+        )
+    # TODO: pass useful return code
+    return Output(__root__=(input.dataset, finished))
\ No newline at end of file
diff --git a/ppg2mel/preprocess.py b/ppg2mel/preprocess.py
index 6da9054..0feee6e 100644
--- a/ppg2mel/preprocess.py
+++ b/ppg2mel/preprocess.py
@@ -110,3 +110,4 @@ def preprocess_dataset(datasets_root, dataset, out_dir, n_processes, ppg_encoder
     t_fid_file.close()
     d_fid_file.close()
     e_fid_file.close()
+    return len(wav_file_list)