The spacing of the main keel of the ceiling is generally 600mm or 1200mm, and the specific spacing should be determined according to the size and weight of the ceiling board. If the ceiling board is light, the spacing can be appropriately increased; If the ceiling board is heavy, it is necessary to reduce the spacing appropriately to ensure the stability and bearing capacity of the ceiling. At the same time, the aesthetics and practicability of the ceiling should also be considered, and the spacing should be adjusted according to the actual situation.