Abstract: This paper reviews the history of flow simulation,points out the key problems about restricting flow simulation development,and proposes that the approach to solve those matters is to intelligentize flow simulation by intercrossing hydraulic science with intelligence science.And this paper presents the theory of flow intelligent model,discusses its construction approaches by means of genetic algorithm,fuzzy logic,cellular automata,chaos theory,artificial neural networks,expert system and data collection,etc,which is important for constructing an excellent flow simulation intelligent system.The Conclusions indicate that intelligentizing of flow simulation becomes a new subject,and the flow intelligent model is a new means to study hydraulic science and has broad prospects.