(1. College of Mining Technology，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China； 2. Yangquan College，Taiyuan University of Technology，Yangquan，Shanxi 045000，China)
Abstract Five rock samples are scanned by μCT225KVFCB test system. The most advanced high-precision microscopic CT test system，and the distribution laws of rock density are studied for the target of ray attenuation coefficient. The results show that the rock micro-element density distribution accords with Weibull distribution. It has obvious aggregation for 90%–95% of the element density of rock distributed in a very narrow range，which provides 30%–40% of density range. In these mainly regions，the particle density of rock accords with normal distribution.
