The water method in the last twelve years comes from the novel Tianyu Jing, which is a three-in-one feng shui formula. Sanhe School, based on Yang Gong's geomantic omen, plays an important role in the field of geomantic omen. This school takes the classics such as Qingnang Aoyu, Tianyu Jing and Three Fingers Secret House as ancestral documents, takes dragon, sand, water, direction and style as the core, and takes the methods of searching for dragon, find holes, sand, water, direction and so on as the main means.