Abstract: The risk analysis in hydraulic engineering system is classified into the single risk assessment and the comprehensive risk assessment in this paper. Various risk analysis methods,developed and applied in hydraulic engineering system,are summarized including the applicable conditions,advantages and disadvantages of each method and their interrelationship. The main methods for the single risk assessment are the mathematical statistics methods,concerning the stochastic uncertainties of the hydraulic system. The comprehensive ones,on the one hand,can take into account the stochastic,fuzzy and grey uncertainties;on the other hand,there still exist some problems,such as the correlation,consistence and impact analysis of behavior factors. Based on the review,some suggestions are putforward,such as choosing appropriate assessment method and integrating the probability with the consequences in risk analysis.