The lighthouse is a tall tower-shaped building. The lighting equipment should be installed in the tower. The location should be obvious, and it should be noted that it should have a specific architectural shape, which is easy for the ship to distinguish and become one of the highest points of the port. Since the surface of the earth is a curved surface, the tower body must have sufficient height so that the light can be seen by a long-distance ship. The general line of sight is 15-25 nautical miles. However, the lighting should not be too high to avoid being covered by high clouds. . According to the size of the lighthouse and the location of the location, the lighthouse can be guarded or unattended. The important lighthouse should be guarded.