Heat-resistant resin for RTM process is prepared,which could be used for missile radomes.Viscosity of the resin is only obout 200 mPa· s after 8 h at 100℃,which is very suitable for RTM process.The cured resin has good heat resistance with Ts of 269℃ and weight loss of 10% at 430℃.Flexual strength of 139 MPa and modulus of 9.5 GPa at 300℃ is obtained for quartz fiber/resin composite,which could be used for a short term at this temperature.