Abstract: By analyzing the non-isothermal RTM process, it is well known that the curing process is the key moment during composite molding. Using control volume and difference scheme methods, the numerical simulation of curing procedure was gotten. In this paper, the internal heat generation caused by the exothermic cure reaction was treated as the nodal lumped load with the help of the control volume technique. The numerical example of a thick plank was compared with experiment data publicly published and good agreement was obtained. The results show that the present procedure is right. The analysis about the influence of the curing process on the material performance on the basis of the procedure is correct.