diff --git a/examples/example1.py b/examples/example1.py
deleted file mode 100644
index e69de29..0000000
diff --git a/examples/examples1/example1.py b/examples/examples1/example1.py
new file mode 100644
index 0000000..d78df49
--- /dev/null
+++ b/examples/examples1/example1.py
@@ -0,0 +1 @@
+from learnware.market import LearnwareMarket
diff --git a/learnware/learnware/__init__.py b/learnware/learnware/__init__.py
index e69de29..7a90eec 100644
--- a/learnware/learnware/__init__.py
+++ b/learnware/learnware/__init__.py
@@ -0,0 +1,3 @@
+class BaseLearnware:
+    def __init__(self) -> None:
+        pass
diff --git a/learnware/market/__init__.py b/learnware/market/__init__.py
index e69de29..0fef201 100644
--- a/learnware/market/__init__.py
+++ b/learnware/market/__init__.py
@@ -0,0 +1 @@
+from .base import LearnwareMarket
diff --git a/learnware/market/base.py b/learnware/market/base.py
new file mode 100644
index 0000000..f14c7c6
--- /dev/null
+++ b/learnware/market/base.py
@@ -0,0 +1,50 @@
+import numpy as np
+import pandas as pd
+from typing import List, Set, Dict
+
+
+class LearnwareMarket:
+    def __init__(self):
+        pass
+
+    def _reload_market(self, a: np.ndarray, b: float, c: List[int], d: Dict[int, float]) -> pd.DataFrame:
+        """_summary_
+
+        Parameters
+        ----------
+        a : np.ndarray
+            _description_
+        b : float
+            _description_
+        c : List[int]
+            _description_
+        d : Dict[int, float]
+            _description_
+
+        Returns
+        -------
+        pd.DataFrame
+            _description_
+
+        Raises
+        ------
+        NotImplemented
+            _description_
+        """
+
+        raise NotImplemented(f"_reload_market is not implemented")
+
+    def add_learnware(self):
+        raise NotImplemented("add_learnware is not implemented")
+
+    def search_learnware(self):
+        raise NotImplemented("search_learnwars is not implemented")
+
+    def get_learnware_by_ids(self):
+        raise NotImplemented("get_learnware_by_ids is not implemented")
+
+    def delete_learnware(self):
+        raise NotImplemented("delete_learnware is not implemented")
+
+    def get_sematic_list(self):
+        raise NotImplemented("get_sematic_list is not implemented")