Abstract: Resin transfer molding (RTM) forming process is a liquid closed mold forming process, which has a smooth surface of the finished product, safety and environmentally friendly, low cost, and has great development potential. Silicone alkyne hybrid resin is an organic-inorganic hybrid resin with excellent high-temperature resistance, widely used in aerospace field, but its poor bonding performance with fibers and poor mechanical properties of composites have become the main factors restricting its development and application. Poly(m-diacetylbenzene-methylhydrosilane) resin (PSA) was modified by blending benzoxazine resin (PBZ) and amino diluent (PAD) to prepare modified silicone alkyne hybrid resin (PPA) suitable for RTM molding process. The RTM molding process, curing behavior, and heat resistance of PPA resin were analyzed by DSC, FTIR, rheometer, rotational viscometer, and thermogravimetry. The results show that the processing window of PPA resin is wide, which can achieve the goal of RTM molding, but the curing temperature is higher than that of PSA resin. The heat resistance of PPA resin is excellent, and the temperature of 5% mass loss (T_d5) of PPA-1 resin (PSA∶PBZ∶PAD mass ratio 5∶1∶2) resin is 585.4℃ and 568.3℃, respectively. The mass retention rates at 1000℃ is 88.3% and 26.0%, respectively. The mechanical property tests show that the mechanical properties of quartz fiber reinforced PPA resin composites (QF/PPA) gradually increase with the increase of PBZ content. The flexural strength of QF/PPA-1 at room temperature is 346.2 MPa, and the interlaminar shear strength is 21.4 MPa, which is 120.6% and 72.6% higher than that of QF/PSA composites, respectively. After thermal aging at 400℃ for 2 h, the flexural strength and interlaminar shear strength are 256.5 MPa and 17.1 MPa, respectively, and the retention rate of mechanical properties after thermal aging at 400℃ for 2 h exceeds 70%.