Abstract: In this paper , research on permeability prediction in RTM process is reviewed based on the study report sin this area both at home and abroad. Several classical models in the analytical method and numerical method aresystematically discussed. The numerical methods applied in permeability prediction are elaborated. The existingproblems in models are also analyzed. A comparison is made between the models to evaluate their respective disadvantages. This article gives a description of the capillary model and regular cylinder model for permeability prediction of unidirectional reinforcement s in details. It also report s the numerical method for permeability prediction ofunidirectional reinforcement s and woven preforms focusing on the asymptotic homogenization method , Lattice-Boltzman method and cell method. The study for permeability estimation of fiber is mainly reviewed based on experimentation at home , the relationship between fiber st ructure and permeability parameter is analyzed , and the effect ofpermeability on resin t ransfer molding progress is studied. Af ter a brief review of the current problems in this arearecent development s and new t rends of research are also described.