Abstract: A cement board made to rapidly and accurately match with a base body. The base body has at least one short and tapered projection extending outward. The cement board includes a concrete slab, a reinforcing frame, and at least one fixing member. The at least one fixing member has at least one positioning hole and at least fixing hole defined thereon. The reinforcing frame is positioned into the concrete slab. The at least one positioning hole is coupled to the at least one projection, to position the cement board onto the base body. The at least one fixing member is coupled to the at least one fixing hole, to fixing the cement board onto the base body. The positioning hole is a tapered hole, a diameter of the positioning hole gradually reduces from one end adjacent to the base body to the other end.