Abstract: Applying fast electric heating techniques, the ultra-high temperature condition of hybrid carbon-carbon composites in practice is simulated. Then its tensile and compressive mechanical properties are measured, both strength and modulus in the longitudinal and the transverse directions of composites are obtained, and simple regressive polynomial fit curves are given also. Results show that both strength and modulus increase with temperature in a certain range, and get the peak at 2000K~2400K, and drop quickly after 2700K. Furthermore, tensile and compressive properties in the longitudinal direction change flatter than those in the transverse direction, and also the strength changes in a narrower range than the modulus.