diff --git a/API_Reference.py b/API_Reference.py
index 4fb6cf5..2159bfd 100644
--- a/API_Reference.py
+++ b/API_Reference.py
@@ -262,6 +262,8 @@ guan.print_array(array, show_index=0, index_type=0)
 
 guan.plot(x_array, y_array, xlabel='x', ylabel='y', title='', fontsize=20, labelsize=20, show=1, save=0, filename='a', format='jpg', dpi=300, style='', y_min=None, y_max=None, linewidth=None, markersize=None, adjust_bottom=0.2, adjust_left=0.2)
 
+guan.plot_two_array(x_array, y1_array, y2_array, xlabel='x', ylabel='y', title='', fontsize=20, labelsize=20, show=1, save=0, filename='a', format='jpg', dpi=300, style_1='', style_2='', y_min=None, y_max=None, linewidth_1=None, linewidth_2=None, markersize_1=None, markersize_2=None, adjust_bottom=0.2, adjust_left=0.2)
+
 guan.plot_3d_surface(x_array, y_array, matrix, xlabel='x', ylabel='y', zlabel='z', title='', fontsize=20, labelsize=15, show=1, save=0, filename='a', format='jpg', dpi=300, z_min=None, z_max=None, rcount=100, ccount=100)
 
 guan.plot_contour(x_array, y_array, matrix, xlabel='x', ylabel='y', title='', fontsize=20, labelsize=15, show=1, save=0, filename='a', format='jpg', dpi=300)
diff --git a/PyPI/setup.cfg b/PyPI/setup.cfg
index ecfe498..004eec2 100644
--- a/PyPI/setup.cfg
+++ b/PyPI/setup.cfg
@@ -1,7 +1,7 @@
 [metadata]
 # replace with your username:
 name = guan
-version = 0.0.107
+version = 0.0.108
 author = guanjihuan
 author_email = guanjihuan@163.com
 description = An open source python package
diff --git a/PyPI/src/guan/__init__.py b/PyPI/src/guan/__init__.py
index 96c524a..dd348d5 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-0.0.107, updated on July 13, 2022.
+# The current version is guan-0.0.108, updated on July 13, 2022.
 
 # Installation: pip install --upgrade guan
 
@@ -1718,6 +1718,35 @@ def plot(x_array, y_array, xlabel='x', ylabel='y', title='', fontsize=20, labels
         plt.show()
     plt.close('all')
 
+def plot_two_array(x_array, y1_array, y2_array, xlabel='x', ylabel='y', title='', fontsize=20, labelsize=20, show=1, save=0, filename='a', format='jpg', dpi=300, style_1='', style_2='', y_min=None, y_max=None, linewidth_1=None, linewidth_2=None, markersize_1=None, markersize_2=None, adjust_bottom=0.2, adjust_left=0.2): 
+    import matplotlib.pyplot as plt
+    fig, ax = plt.subplots()
+    plt.subplots_adjust(bottom=adjust_bottom, left=adjust_left) 
+    ax.plot(x_array, y1_array, style_1, linewidth=linewidth_1, markersize=markersize_1)
+    ax.plot(x_array, y2_array, style_2, linewidth=linewidth_2, markersize=markersize_2)
+    ax.grid()
+    ax.set_title(title, fontsize=fontsize, fontfamily='Times New Roman')
+    ax.set_xlabel(xlabel, fontsize=fontsize, fontfamily='Times New Roman') 
+    ax.set_ylabel(ylabel, fontsize=fontsize, fontfamily='Times New Roman') 
+    if y_min!=None or y_max!=None:
+        if y_min==None:
+            y1_min=min(y1_array)
+            y2_min=min(y1_array)
+            y_min=min([y1_min, y2_min])
+        if y_max==None:
+            y1_max=max(y1_array)
+            y2_max=max(y2_array)
+            y_max=max([y1_max, y2_max])
+        ax.set_ylim(y_min, y_max)
+    ax.tick_params(labelsize=labelsize) 
+    labels = ax.get_xticklabels() + ax.get_yticklabels()
+    [label.set_fontname('Times New Roman') for label in labels]
+    if save == 1:
+        plt.savefig(filename+'.'+format, dpi=dpi) 
+    if show == 1:
+        plt.show()
+    plt.close('all')
+
 def plot_3d_surface(x_array, y_array, matrix, xlabel='x', ylabel='y', zlabel='z', title='', fontsize=20, labelsize=15, show=1, save=0, filename='a', format='jpg', dpi=300, z_min=None, z_max=None, rcount=100, ccount=100): 
     import matplotlib.pyplot as plt
     from matplotlib import cm