On the RMT-150C rock mechanics testing machine, test different loading rates of rock crushing with spherical indenter and cross indenter, using KBD5 electromagnetic emission data acquisition and processing system collect and handle electromagnetic emission signal during rock crushing process. Fractal characteristics of electromagnetic emission pulses were analyzed by fractal theory.The results show, in the process of the specimen loaded,electromagnetic emission pulse number has obvious fractal characteristics with time, and with the increase of the loading rate,the intensity of electromagnetic radiation signal increases,the fractal dimension D also increases which has a good correlation. Under rock loading and crushing of the same rate, cross indenter electromagnetic emission fractal dimension D is larger than spherical indenter , which has the same law to the intensity change of the electromagnetic emission pulse signal, by using the same law of the electromagnetic emission pulse signal and the fractal dimension D, the real fracture process of the rock is more fully reflected.