1. Mural art occupies a prominent position in Xinjiang grottoes. The painting method of murals adopts the daubing method popular in ancient western regions, that is, the concave-convex method, combined with the outline of "iron line drawing" One of the most famous is the Qizil Grottoes in Baicheng.

2. Murals are European murals in the late Paleolithic period. In the cave of altamira in Santander, northern Spain. The cave is 270 meters long, and most murals are distributed on the top and wall of the side cave, with a length of 18 meters.