The occurring probability of various risks in railway tunnels is higher than that in other projects. Once the risks occur, they will cause huge losses. Along with the development of the society and the improving of the people's safety awareness, tunneling risk reassessment and dynamic risk control, which are the most effective, most economic, most reliable and most safe tunneling risk control methods, are gradually recongnized and accepted. Unfortunately, as a new technology, these methods have so far not been popularized. Regarding how to reassess the tunneling risks and how to dynamically control the risks, the author makes a summary in this paper on basis of the successful experience in the control of the adverse geological risks in extralong Xuefengshan tunnel. This paper can provide reference for similar projects in the future.