Abstract: The wear behavior of SiC-particulate reinforced 6061 aluminum alloy in dry sliding against a particulate reinforced rubber-based composite was investigated on a block-on-disc high-speed test rig developed in Northern Jiaotong University of China. Observations were focused on the periodicity of the wear behavior and the randomness of the variation of the wear magnitude of the alloy, by means of continuous test, discontinuous test, and repeated tests. All the friction and wear tests were carried out at ambient temperature and sliding speeds of speed 20 m/s and 40 m/s. A statistical wear model was suggested, based on analysis of the hazard-rate of the wear behavior, and some characteristics of the probability distribution in magnitude of periodic wear were discussed in combination with the test data. The results show that the probability average and the scattering extent of the magnitude of periodic wear were related to the sliding speed, while the lower limit of the periodic wear was independent on the sliding speed.