Abstract: The analyses of melt flow and the prediction of fiber fracture and orientation are tightly related. Therefore an integrated simulation of all the above aspects is necessary. In this paper, based on the analyses of the features of melt flow,fiber fracture and fiber orientation in injection molding, an integrated simulation model is presented. The proposed model can simultaneously simulate the asymmetric melt flow with compressible fluid during the filling and postfilling stages and complex fiber fracture and orientation behaviors induced by melt flow, and couple the melt flow and fiber orientation.