A pore ordered and size controlled porous C/SiC composite was prepared with dipped and controlled pyrolysis of polycabosilan(PIP) bioporous carbon as the template derived from natural wood. The microstructure, antioxide property and mechanical properties of the composites obtained were characterized through XRD, SEM, BET, etc. The result showed that the phase of the SiC obtained was amporhous and combined well with the inner surface of BPC, which could raise the oxidation temperature of BPC by 150 ℃. With the increase of cycles times, the specific area of BPC/SiC decreased and the pores evaluated from rectangular to ellipse and finally to circle. The compressive strength of the composite first increased with the times of dippyrolysis cycle and then surrendered. A maximum axial compressive strength of 56.7 MPa occurred during 5 cycles, while 17.0 MPa of radical occurred during 6 cycles.