Study on supervision, alarm and emergency system for subway in big city

In recent years, more and more emergency event occurred in national and international subway transportation system, which brings huge challenge for Subway safety. With the increase of subway mileage in big city in China, it is very important and urgent to build a supervision, alarm and emergency system in order to ensure the safety of subway transportation. In this paper, on the basis to analysis the risk of emergency event that faced by subway, the framework of supervision, alarm and emergency system are given, the main function and interface of supervision, alarm and emergency system also are outlined.