Abstract: in order to reduce energy consumption during prepaing ultrafine pulverzed coal of coal water slury.the high pressure water jet comminution tfechmiqueand the trationalball il rinding techrique were adopted to crsh coal samples by controlig the grinding time,based on ensuring the same coal paricle size,the peper analyzed their required energy consumption.The resuts showed that high pressure water jet comminution techncogy not anly et the reurements of the preparaton of utrafine pulverized coal particle size ,and is energy consumption was only 1/10~1 /6 oftraditonalball.mll riding energy consumpfion.T he acquireduitra inepulverized coal paricles with high pressure water jet comminution technology had smooth surace,no impurities adhesion.no conoection between paticles which was beneficial to separation,and with high rate of water slurry and accumulation efficiency.