Abstract: The magnetoresistance (MR) characteristic of C/C composites fabricated with in the preform with short carbon fibers and treated at different heat treatment temperatures (HTT), were investigated. Results show that the shape of the MR-orientation curves of C/C composites depends on the fiber texture of the preform. The temperature from which the MR of C/C composites changes to zero is related to the graphitization behavior of the C/C composites. With an increase in the degree of graphitization, the MR of the composites increases and the temperature when the MR changes to zero also increases. The slope (k) of the regressing equation of the curve of MR versus temperature decreases with an increase of HTT, and the shape of the k-HTT curve is similar to that of the d002-HTT curve.