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RTM about the front floor of the car, examines the different injection methods, different influence of distance of hose guide for filling time, analyzing the resin flow patterns, the effects of the mold cavity pressure distribution and the overflow outlet location on the floor molding, and got the shortest time of program filling of the floor. From a test about VARI molding of the floor on the former basis, got the filling time 820s and it is consistent with simulation results 982s.The research results have important significance for research and application of carbon fiber composites.