As the development of composite material and computer technology, the role of numerical simulation in production process becomes more and more important. The study progress of numerical simulation in autoclave process is summarized, including the flow field in the autoclave, controlling of curing heat, prediction of distortion by curing, as well as the simulation of hot drape forming. As the development of big data and the automation and intelligentization of composite,the development of numerical simulation is an irresistible trend.