The towers for large-crossing transmission lines are usually high and located on the riverside or seashore, where the climate conditions are poor. As the operation requirement of the large-crossing towers is increasing, such requirements as comfort and convenience are also proposed for the tower-ascending facilities on the prerequisite for safety. The paper summarizes the functions and design method of various common tower-ascending facilities such as the shackles, ladders, elevators and tower-climbing machines, which can be used as a reference for designing auxiliary structures of large-crossing towers.