diff --git a/global_var.py b/global_var.py
index 53566d5..69d353a 100644
--- a/global_var.py
+++ b/global_var.py
@@ -6,10 +6,15 @@ _sql_engine = None
 _docs = None
 _datasets = None
 
+def init_global_var(workdir="workdir"):
+    """Initialize all global variables"""
+    global _prompt_store, _sql_engine, _docs, _datasets
+    _prompt_store = get_prompt_tinydb(workdir)
+    _sql_engine = get_sqlite_engine(workdir)
+    _docs = scan_docs_directory(workdir)
+    _datasets = get_all_dataset(workdir)
+
 def get_prompt_store():
-    global _prompt_store
-    if _prompt_store is None:
-        _prompt_store = get_prompt_tinydb("workdir")
     return _prompt_store
 
 def set_prompt_store(new_prompt_store):
@@ -17,9 +22,6 @@ def set_prompt_store(new_prompt_store):
     _prompt_store = new_prompt_store
 
 def get_sql_engine():
-    global _sql_engine
-    if _sql_engine is None:
-        _sql_engine = get_sqlite_engine("workdir")
     return _sql_engine
 
 def set_sql_engine(new_sql_engine):
@@ -27,9 +29,6 @@ def set_sql_engine(new_sql_engine):
     _sql_engine = new_sql_engine
 
 def get_docs():
-    global _docs
-    if _docs is None:
-        _docs = scan_docs_directory("workdir")
     return _docs
 
 def set_docs(new_docs):
@@ -37,9 +36,6 @@ def set_docs(new_docs):
     _docs = new_docs
 
 def get_datasets():
-    global _datasets
-    if _datasets is None:
-        _datasets = get_all_dataset("workdir")
     return _datasets
 
 def set_datasets(new_datasets):
diff --git a/main.py b/main.py
index 3797c1e..1158201 100644
--- a/main.py
+++ b/main.py
@@ -1,12 +1,13 @@
 import gradio as gr
 from frontend.setting_page import setting_page
 from frontend import *
-from db import initialize_sqlite_db,initialize_prompt_store
-from global_var import sql_engine,prompt_store
+from db import initialize_sqlite_db, initialize_prompt_store
+from global_var import init_global_var, get_sql_engine, get_prompt_store
 
 if __name__ == "__main__":
-    initialize_sqlite_db(sql_engine)
-    initialize_prompt_store(prompt_store)
+    init_global_var()
+    initialize_sqlite_db(get_sql_engine())
+    initialize_prompt_store(get_prompt_store())
     with gr.Blocks() as app:
         gr.Markdown("# 基于文档驱动的自适应编码大模型微调框架")
         with gr.Tabs():