2. Pay attention to the five principles of geomantic omen in cemeteries. Among them, the principle of relying on mountains and rivers is the basic principle of a good cemetery; The principle of embracing left and right is "left green dragon and right white tiger, before rosefinch and after Xuanwu", which is surrounded by mountains on all sides; The principle of opening a hall is conducive to cultivating talents and developing careers, and requires a broad and flat place in front of the tomb; Return to nature, attach importance to the principle of nature first and harmony between man and nature; Bending principle, the purpose of this principle is to prevent suffocation caused by frontal collision.