In these years, tunnel projects have been raising significantly in quantity and quality with the increasing of city constructions and expressways.Meanwhile, people are paying more attention on safety problems in tunnel constructions. This article has adapted some countries’ tunnel experiences and discusses the main safety problems in tunnel, how to monitor these problems, summarizes the principles and what measurements can be used for different categories problems with some relevant cases. Analyses these information and experience, so that it will have essential impacts on guiding the risks identification and safety management. The article mainly concentrates on these parts: This paper analyzes the typical tunnel construction safety cases with main risk sources, the conditions of risk factors and the mechanism of the tunnel risks to provide basis for assessment.