Based on the characteristics of strong weathered granite,i.e.disintegrating and softening when contacting with water,we will appraise the pipeline’s wear loss in the process of material’s conveying from the migration,soil particle size distribution,particle shape,roundness,hardness,etc.According to the wear loss of pipeline section’s different position,we know that the large wear at the bottom of the pipe is due to the friction,impacting and cutting on the pipe wall from the gravel sand of 0.25 ～ 5 mm particle size and granite residual block with the particle size of greater than 5 mm.This paper discusses the pipeline’s wearing rule.