Taking wear physics problem of high pressure cutting nozzle in using coal-bearing water in mine as research object and using computational fluid dynamics theory to make numerical calculation,this paper analyzed and discussed the distribution and changing relations of velocity,shear stress,wear under the different condition of mass concentration as 10,15,20,25,30 and 40 mg/L.The results indicated that wear mainly happened in the outlet and the latter half of cone,wear loss of inlet and the first half of cone...