diff --git a/lang/zh/gklearn/preimage/preimage_generator.py b/lang/zh/gklearn/preimage/preimage_generator.py
new file mode 100644
index 0000000..306eb12
--- /dev/null
+++ b/lang/zh/gklearn/preimage/preimage_generator.py
@@ -0,0 +1,49 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Created on Thu Mar 26 18:26:36 2020
+
+@author: ljia
+"""
+# from gklearn.utils import Dataset
+
+class PreimageGenerator(object):
+	
+	def __init__(self, dataset=None):
+		# arguments to set.
+		self._dataset = None if dataset is None else dataset
+		self._kernel_options = {}
+		self._graph_kernel = None
+		self._verbose = 2
+
+	@property
+	def dataset(self):
+		return self._dataset
+
+	@dataset.setter
+	def dataset(self, value):
+		self._dataset = value		
+		
+	
+	@property
+	def kernel_options(self):
+		return self._kernel_options
+	
+	@kernel_options.setter
+	def kernel_options(self, value):
+		self._kernel_options = value
+
+
+	@property
+	def graph_kernel(self):
+		return self._graph_kernel
+		
+		
+	@property
+	def verbose(self):
+		return self._verbose
+
+	@verbose.setter
+	def verbose(self, value):
+		self._verbose = value
+