This paper points out the importance of antifall beam device for simply-supported beam Bridges in seismic-active areas, introduces the main application type of antifall beam device, its characteristics, selection methods and precautions, and describes the design steps, specific structures and engineering application examples of commonly used type of antifall beam device in our country. It is considered that the installation of anti-fall beam device will provide reliable guarantee for the safety of bridge structure in China under strong earthquake action.