diff --git a/API_Reference/API_Reference.py b/API_Reference/API_Reference.py
index e4641c6..dac8657 100644
--- a/API_Reference/API_Reference.py
+++ b/API_Reference/API_Reference.py
@@ -381,6 +381,12 @@ wilson_loop_array = guan.calculate_wilson_loop(hamiltonian_function, k_min=-math
 
 # Module 10: read and write
 
+# 将数据存到文件
+guan.dump_data(data, filename, file_format='.txt')
+
+# 从文件中恢复数据到变量
+data = guan.load_data(filename, file_format='.txt')
+
 # 读取文件中的一维数据（每一行一组x和y）
 x_array, y_array = guan.read_one_dimensional_data(filename='a', file_format='.txt')
 
diff --git a/Source_Code/PyPI/setup.cfg b/Source_Code/PyPI/setup.cfg
index 1b864c3..3d3c5fc 100644
--- a/Source_Code/PyPI/setup.cfg
+++ b/Source_Code/PyPI/setup.cfg
@@ -1,7 +1,7 @@
 [metadata]
 # replace with your username:
 name = guan
-version = 0.0.177
+version = 0.0.179
 author = guanjihuan
 author_email = guanjihuan@163.com
 description = An open source python package
diff --git a/Source_Code/PyPI/src/guan.egg-info/PKG-INFO b/Source_Code/PyPI/src/guan.egg-info/PKG-INFO
index e761696..13c1d30 100644
--- a/Source_Code/PyPI/src/guan.egg-info/PKG-INFO
+++ b/Source_Code/PyPI/src/guan.egg-info/PKG-INFO
@@ -1,6 +1,6 @@
 Metadata-Version: 2.1
 Name: guan
-Version: 0.0.177
+Version: 0.0.179
 Summary: An open source python package
 Home-page: https://py.guanjihuan.com
 Author: guanjihuan
diff --git a/Source_Code/PyPI/src/guan/__init__.py b/Source_Code/PyPI/src/guan/__init__.py
index 94bae9f..3911090 100644
--- a/Source_Code/PyPI/src/guan/__init__.py
+++ b/Source_Code/PyPI/src/guan/__init__.py
@@ -2,7 +2,7 @@
 
 # With this package, you can calculate band structures, density of states, quantum transport and topological invariant of tight-binding models by invoking the functions you need. Other frequently used functions are also integrated in this package, such as file reading/writing, figure plotting, data processing.
 
-# The current version is guan-0.0.177, updated on September 29, 2023.
+# The current version is guan-0.0.179, updated on September 29, 2023.
 
 # Installation: pip install --upgrade guan
 
@@ -2229,6 +2229,19 @@ def calculate_wilson_loop(hamiltonian_function, k_min=-math.pi, k_max=math.pi, p
 
 # Module 10: read and write
 
+# 将数据存到文件
+def dump_data(data, filename, file_format='.txt'):
+    import pickle
+    with open(filename+file_format, 'wb') as f:
+	    pickle.dump(data, f)
+
+# 从文件中恢复数据到变量
+def load_data(filename, file_format='.txt'):
+    import pickle
+    with open(filename+file_format, 'rb') as f:
+	    data = pickle.load(f)
+    return data
+
 # 读取文件中的一维数据（每一行一组x和y）
 def read_one_dimensional_data(filename='a', file_format='.txt'): 
     f = open(filename+file_format, 'r')