Abstract: Fine weave pierced C/C throat was fabricated using electrically coupled chemical vapour impregnation(CVI) process together with resin infiltration and carbonization method. The pore size of fine weave pierced preform at different densification stages was characterized by μ-CT. Tensile properties of the samples at 2 800℃ and the ablation behaviors of the scaling down motor were also discussed. The results show that pores are located in between the fiber bundles in the material after the electrically coupled CVI, where the pores joint their boundaries to form the carbon body a net structure. Some micro pores, which sized 0-0.08 mm³ and scattered dispersed in the body, were left after several resin infiltration and carbonization cycles. The tensile strength is a little higher, but the fracture strain is increased by 118% at 2 800℃ than that at room temperature, which mean that the material possesses abnormal non-liner fracture behavior. The liner ablation rate is 0.077 mm/s for the material in a scaling solid motor. There are different ablation mechanisms for different throat parts:there are severe stagnations ablation at the convergent part which caused the honeycomb ablation dots, while the throat and divergent part have smooth ablation surfaces.