diff --git a/API_Reference.py b/API_Reference.py
index a7dc194..98ff18e 100644
--- a/API_Reference.py
+++ b/API_Reference.py
@@ -244,7 +244,7 @@ guan.print_or_write_scattering_matrix(fermi_energy, h00, h01, length=100, print_
 
 # Module 9: topological invariant
 
-chern_number = guan.calculate_chern_number_for_square_lattice_efficient_method(hamiltonian_function, precision=100, print_show=0)
+chern_number = guan.calculate_chern_number_for_square_lattice_with_efficient_method(hamiltonian_function, precision=100, print_show=0)
 
 chern_number = guan.calculate_chern_number_for_square_lattice_with_wilson_loop(hamiltonian_function, precision_of_plaquettes=20, precision_of_wilson_loop=5, print_show=0)
 
diff --git a/PyPI/setup.cfg b/PyPI/setup.cfg
index fb38f1d..799e8f9 100644
--- a/PyPI/setup.cfg
+++ b/PyPI/setup.cfg
@@ -1,7 +1,7 @@
 [metadata]
 # replace with your username:
 name = guan
-version = 0.0.123
+version = 0.0.124
 author = guanjihuan
 author_email = guanjihuan@163.com
 description = An open source python package
diff --git a/PyPI/src/guan.egg-info/PKG-INFO b/PyPI/src/guan.egg-info/PKG-INFO
index 47739e4..a27f2fc 100644
--- a/PyPI/src/guan.egg-info/PKG-INFO
+++ b/PyPI/src/guan.egg-info/PKG-INFO
@@ -1,6 +1,6 @@
 Metadata-Version: 2.1
 Name: guan
-Version: 0.0.123
+Version: 0.0.124
 Summary: An open source python package
 Home-page: https://py.guanjihuan.com
 Author: guanjihuan
diff --git a/PyPI/src/guan/__init__.py b/PyPI/src/guan/__init__.py
index eb3b2be..218bd29 100644
--- a/PyPI/src/guan/__init__.py
+++ b/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-0.0.123, updated on August 13, 2022.
+# The current version is guan-0.0.124, updated on August 13, 2022.
 
 # Installation: pip install --upgrade guan
 
@@ -1518,7 +1518,7 @@ def print_or_write_scattering_matrix(fermi_energy, h00, h01, length=100, print_s
 
 # Module 9: topological invariant
 
-def calculate_chern_number_for_square_lattice_efficient_method(hamiltonian_function, precision=100, print_show=0):
+def calculate_chern_number_for_square_lattice_with_efficient_method(hamiltonian_function, precision=100, print_show=0):
     if np.array(hamiltonian_function(0, 0)).shape==():
         dim = 1
     else: