The Ming Great Wall in Huairou has a variety of architectural forms such as brick and stone masonry, stone masonry, and rough stone masonry. The technology is complex and can be called a miracle. However, natural disasters and natural erosion over the past hundreds of years have damaged many buildings such as the watchtowers and side walls of the Great Wall, and some sections have collapsed and been seriously damaged. Protective repair of the Great Wall is imperative. Cheng Yongmao, as the 16th generation of Xinglongmen Tile Worker, has been engaged in the repair of the Great Wall for many years and has unique Great Wall repair technology. This is a skill that plays an important role in the future protection of the Great Wall, and we must preserve and pass it down.