Abstract: The process characteristics of vinyl resin for RTM and the mechanical properties of the resin and its composite materials are studied. The resin has a relatively low viscosity, about 240 mPa·s at 25℃. The gel time of the resin is analyzed, and the function of gel time and temperature is obtained. The apparent activation energy is relatively large, so the resin temperature should be strictly controlled in the process of molding. DSC curve is applied to analyze the curing exothermic behavior of the vinyl resin at different heating rates, and the theoretical gel temperature, curing temperature and post-curing temperature of the resin are obtained. The resin and composite materials have good mechanical properties.