Mud painting is a traditional painting that uses mud as the main material, mixed with a certain proportion of wheat straw, wheat husk, cotton wool, hemp rope, hair and other auxiliary materials. After adding water and stirring, it is attached to the hard board that meets the requirements in different layers, and then it is formed after smoothing, drying, drafting, outlining, coloring and other steps. Mud painting has a strong regional characteristic and religious color. It is the experience summary of ancient craftsmen in copying or recreating precious murals, rock paintings and other immovable art treasures. It has made great contributions to many aspects such as society, religion, architecture, art, and cultural relics protection. Ruicheng is located in the Loess Plateau, which is full of highly plastic yellow clay. After the clay is mixed with fine linen and wheat straw, it is attached to the wall and becomes a natural main material for creating murals. In addition, the Loess Plateau is full of gullies and there are few wars. A large number of ancient building murals are preserved in the area, which has created prerequisites for the creation and promotion of mud painting. When making mud skin paintings, first-hand information should be obtained, and then copied, outlined, filled with colors, polished, aged, reinforced and sealed. After the information is obtained, the manuscript is transferred to the mud skin, and then it is made with mineral pigments and traditional manual techniques. The lines and colors in the early days were simple, and they became richer, more complicated and more detailed later, and the painting methods were more rendered. The use of mud skin as a carrier to draw is very close to the original. After the original is lost, the mud skin murals can leave the style of the original for future generations, and it can be completed in different spaces and times. Ruicheng mud skin paintings have a wide range of content, exquisite painting, and bright colors. They provide a good copy for further copying the appearance of ancient murals. It not only enriches the art of ancient Chinese painting, but also provides precious information for the study of ancient history, painting art, social life, etc., and has important academic research value. (No pictures yet, welcome to provide.) (No pictures yet, welcome to provide.)