Abstract: Totally 98,000 reservoir dams of various types have been built in China, forming a solid foundation of the security system for flood control, water supply, grain production, power generation, and ecological protection. However, nearly 40% of these dams were dangerous at the beginning of this century, when dam construction was restricted and influenced by various factors, such as the national strength and conditions and the level of science and technology. Besides, quite a few projects are suffering from aging and deterioration in varying degrees and thus posing a grave threat to the service of the reservoirs and dams and even to their safety. To improve the safety of dangerous reservoirs and dams comprehensively, a large-scale reinforcement construction has been carried out in China. Meanwhile, reinforcement of reservoirs and dams will be a normal work as a large number of projects become aged. This paper reviews the gravity dams along with the existing danger-removal and control measures, and discusses the state of art in typical engineering measures and performance evaluation on them, focusing on four aspects: seepage safety and performance evaluation of the danger-removal and control measures, crack safety and performance evaluation of the danger control-removal measures, structure stability and performance evaluation of the stabilizing measures, and dam service reliability and evaluation of danger control and reinforcement. This study recommends that in future, an intensive research should be focused on six directions: a joint use of various danger-removal and control measures, combination of deterministic and nondeterministic methods for evaluation of seepage control performance, the mechanism of crack suppression and bearing capacity enhancement, changes in the energy of a gravity dam system caused by stability strengthening, analysis of gravity dam service reliability, and comprehensive contribution by danger-removal and reinforcement, so as to develop and perfect a system of major engineering measures for gravity dams and evaluation of their performance.