Benzoxazine resin is used to fabricate quartz fiber reinforced composites by RTM process in the paper. The processing properties and mechanical performances of benzoxazine resin are studied systematically, and quartz/benzoxazine resin composites are manufactured by RTM to test their mechanical performances and ablation properties. Some properties are compared with those of barium-phenolic resin and its quartz fiber composites. The results show that benzoxazine resin maintains low-viscosity less than 800mPa.s in the range from 85℃ to 145℃, and has a wide low-viscosity temperature window and a long low-viscosity keeping time. The interlaminar shear strength(ILSS) of quartz/benzoxazine resin composites reaches 61.5MPa, the tensile strength and the flexural strength are more excellent than those of quartz/barium-phenolic resin composites. The mass ablation rate and line ablation rate of quartz/benzoxazine composites reach 0.0510g(s^-1and 0.032mm(s^-1 , respectively. Quartz/benzoxazine resin composites can be used as ablative materials and fabricated by RTM process.