According to the requirement of resin for ablated heat-resistant composites by RTM process,a solvent-free high residual carbon ablative resin for RTM process and its normal reinforced composites were studied.The viscosity-temperature characteristics,heat resistance,ablative properties,mechanical properties and thermal-physical properties of composites were discussed in detail,and the thermal test of solid rocket egine was carried out for the components of ablative material by RTM.Experimential results show that RTM process applicable period of this ablative resin is as long as 120 mins,its carbon residue rate is 67.1%,interlayer shear strength of the normal reinforced composites is 39.3 MPa.It shows good characteristics of solid rocket egine exiting section materials.