diff --git a/sdf_helper/HDF5_plotter.py b/sdf_helper/HDF5_plotter.py
new file mode 100644
index 0000000..d04dcdc
--- /dev/null
+++ b/sdf_helper/HDF5_plotter.py
@@ -0,0 +1,13 @@
+import h5py
+import numpy as np
+import matplotlib.pyplot as plt
+
+f = h5py.File('data.h5','r')   #開啟h5檔案
+print(f.keys())                            #可以檢視所有的主鍵
+domain = f['Electric_Field_Ey'][:]                    #取出主鍵為data的所有的鍵值
+f.close()
+
+plt.contourf(domain)
+plt.colorbar()
+plt.show()
+plt.clf()
\ No newline at end of file
diff --git a/sdf_helper/SDF2HDF5.py b/sdf_helper/SDF2HDF5.py
new file mode 100644
index 0000000..6b8b28f
--- /dev/null
+++ b/sdf_helper/SDF2HDF5.py
@@ -0,0 +1,30 @@
+# -*- coding: utf-8 -*-
+"""
+Created on Wed Oct  6 22:40:44 2021
+
+@author: Jennan Wang
+"""
+
+import sdf_helper as sh
+import h5py
+
+sdf_file_name = '0004.sdf' #sdf file name, assume call it at same folder for sdf
+data = sh.getdata(sdf_file_name) #get attribute string
+attri_str = str(sh.list_variables(data)).splitlines() #string processing...
+variable_str_list = [] #string processing...
+h5f = h5py.File(str(sdf_file_name+'.h5'), 'w') #open hdf5 file
+h5f_data = [] #container for hdf5 data
+
+for i in attri_str:
+    variable_str_list.append((i.split(' '))[0])  #string processing...
+    exec("h5f_data.append(data.%s.data)" % (variable_str_list[-1])) 
+    #put sdf data to container for hdf5 data by calling it's variables
+    h5f.create_dataset(variable_str_list[-1], data=h5f_data[-1]) #write to hdf5 file
+    
+h5f.close() #close hdf5 file
+
+
+
+
+
+
diff --git a/sdf_helper/sdf_helper.py b/sdf_helper/sdf_helper.py
index debbafb..2141e93 100644
--- a/sdf_helper/sdf_helper.py
+++ b/sdf_helper/sdf_helper.py
@@ -2042,13 +2042,19 @@ def subarray(base, slices):
 
 def list_variables(data):
     dct = data.__dict__
+    str_variables = ''
     for key in sorted(dct):
         try:
             val = dct[key]
             print('{} {} {}'.format(key, type(val),
                   np.array2string(np.array(val.dims), separator=', ')))
+            str_variables += '{} {} {}'.format(key, type(val),
+                  np.array2string(np.array(val.dims), separator=', '))
+            str_variables += '\n'
         except:
+            return str_variables
             pass
+    return str_variables
 
 
 def escape_latex(string):