Mogao Grottoes is located in the western end of the Hexi Corridor along the ancient Silk Road in Dunhuang, China. From 366 to 1368 AD, a large group of Buddha caves were constructed that consists of 735 caves, 45,000 m2 mural paintings, and 2,415 argillaceous painted sculptures. It was listed as a World Heritage Site in 1987. Until now, most mural paintings at Mogao Grottoes have been dated by directly referring to the mural texts or historical documents. However, the ages of some are undetermined due to the lack of reference materials or the disagreement of art experts in paintings.