To improve the processing properties of benzoxazine for resin transfer moulding(RTM) and high temperature resistance of benzoxazine based composites,acetylene group was used to modify benzoxazine resin.With the participate of acetylene group,the cured benzoxazine resin could have a higher crosslink density ,and the resin would exhibits a lower viscosity.The results shows that the acetylene-functional benzoxazine(AFBA)exhibits a viscosity of 805 mPa·s at 81.5 ℃,and it is suitable for RTM at 110 ℃ with 310 min.According to the DSC results,the curing of AFBA started from 130 ℃ and ended at 208 ℃.The DMA and TGA curves of AFBA/CF composites exhibit a glass transition temperature peak at 411 ℃ and a char yield of 88.6% at 800 ℃.Moreover,the composites retained more than 99% of tensile properties,more than 70% of flexural and interlaminar shear properties and 60.9% of compressive strength at 350 ℃.