diff --git a/lang/zh/gklearn/ged/methods/ged_method.py b/lang/zh/gklearn/ged/methods/ged_method.py
new file mode 100644
index 0000000..aecd16b
--- /dev/null
+++ b/lang/zh/gklearn/ged/methods/ged_method.py
@@ -0,0 +1,195 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Created on Thu Jun 18 15:52:35 2020
+
+@author: ljia
+"""
+import numpy as np
+import time
+import networkx as nx
+
+
+class GEDMethod(object):
+	
+	
+	def __init__(self, ged_data):
+		self._initialized = False
+		self._ged_data = ged_data
+		self._options = None
+		self._lower_bound = 0
+		self._upper_bound = np.inf
+		self._node_map = [0, 0] # @todo
+		self._runtime = None
+		self._init_time = None
+		
+	
+	def init(self):
+		"""Initializes the method with options specified by set_options().
+		"""
+		start = time.time()
+		self._ged_init()
+		end = time.time()
+		self._init_time = end - start
+		self._initialized = True
+		
+		
+	def set_options(self, options):
+		"""
+	/*!
+	 * @brief Sets the options of the method.
+	 * @param[in] options String of the form <tt>[--@<option@> @<arg@>] [...]</tt>, where @p option contains neither spaces nor single quotes,
+	 * and @p arg contains neither spaces nor single quotes or is of the form <tt>'[--@<sub-option@> @<sub-arg@>] [...]'</tt>,
+	 * where both @p sub-option and @p sub-arg contain neither spaces nor single quotes.
+	 */
+		"""
+		self._ged_set_default_options()
+		for key, val in options.items():
+			if not self._ged_parse_option(key, val):
+				raise Exception('Invalid option "', key, '". Usage: options = "' + self._ged_valid_options_string() + '".') # @todo: not implemented.
+		self._initialized = False
+		
+		
+	def run(self, g_id, h_id):
+		"""
+	/*!
+	 * @brief Runs the method with options specified by set_options().
+	 * @param[in] g_id ID of input graph.
+	 * @param[in] h_id ID of input graph.
+	 */
+		"""
+		start = time.time()
+		result = self.run_as_util(self._ged_data._graphs[g_id], self._ged_data._graphs[h_id])
+		end = time.time()
+		self._lower_bound = result['lower_bound']
+		self._upper_bound = result['upper_bound']
+		if len(result['node_maps']) > 0:
+			self._node_map = result['node_maps'][0]
+		self._runtime = end - start
+		
+		
+	def run_as_util(self, g, h):
+		"""
+	/*!
+	 * @brief Runs the method with options specified by set_options().
+	 * @param[in] g Input graph.
+	 * @param[in] h Input graph.
+	 * @param[out] result Result variable.
+	 */
+		"""
+		# Compute optimal solution and return if at least one of the two graphs is empty.
+		if nx.number_of_nodes(g) == 0 or nx.number_of_nodes(h) == 0:
+			print('This is not implemented.')
+			pass # @todo:
+			
+		# Run the method.
+		return self._ged_run(g, h)
+		
+		
+	def get_upper_bound(self):
+		"""
+	/*!
+	 * @brief Returns an upper bound.
+	 * @return Upper bound for graph edit distance provided by last call to run() or -1 if the method does not yield an upper bound.
+	 */
+		"""
+		return self._upper_bound
+		
+		
+	def get_lower_bound(self):
+		"""
+	/*!
+	 * @brief Returns a lower bound.
+	 * @return Lower bound for graph edit distance provided by last call to run() or -1 if the method does not yield a lower bound.
+	 */
+		"""
+		return self._lower_bound
+		
+		
+	def get_runtime(self):
+		"""
+	/*!
+	 * @brief Returns the runtime.
+	 * @return Runtime of last call to run() in seconds.
+	 */
+		"""
+		return self._runtime
+	
+
+	def get_init_time(self):
+		"""
+	/*!
+	 * @brief Returns the initialization time.
+	 * @return Runtime of last call to init() in seconds.
+	 */
+		"""		
+		return self._init_time
+
+
+	def get_node_map(self):
+		"""
+	/*!
+	 * @brief Returns a graph matching.
+	 * @return Constant reference to graph matching provided by last call to run() or to an empty matching if the method does not yield a matching.
+	 */
+		"""
+		return self._node_map
+		
+		
+	def _ged_init(self):
+		"""
+	/*!
+	 * @brief Initializes the method.
+	 * @note Must be overridden by derived classes that require initialization.
+	 */
+		"""
+		pass
+			
+			
+	def _ged_parse_option(self, option, arg):
+		"""
+	/*!
+	 * @brief Parses one option.
+	 * @param[in] option The name of the option.
+	 * @param[in] arg The argument of the option.
+	 * @return Boolean @p true if @p option is a valid option name for the method and @p false otherwise.
+	 * @note Must be overridden by derived classes that have options.
+	 */
+		"""
+		return False
+	
+	
+	def _ged_run(self, g, h):
+		"""
+	/*!
+	 * @brief Runs the method with options specified by set_options().
+	 * @param[in] g Input graph.
+	 * @param[in] h Input graph.
+	 * @param[out] result Result variable.
+	 * @note Must be overridden by derived classes.
+	 */
+		"""
+		return {}
+		
+	
+	
+	def _ged_valid_options_string(self):
+		"""
+	/*!
+	 * @brief Returns string of all valid options.
+	 * @return String of the form <tt>[--@<option@> @<arg@>] [...]</tt>.
+	 * @note Must be overridden by derived classes that have options.
+	 */
+		"""
+		return ''
+		
+		
+	def _ged_set_default_options(self):
+		"""
+	/*!
+	 * @brief Sets all options to default values.
+	 * @note Must be overridden by derived classes that have options.
+	 */
+		"""
+		pass
+		
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