本文为利用高压水射流来切割和破碎岩石的方法有关的试验研究。利用升压器造成可达630MN/m~2的压力。试验得出最适的喷嘴形状为,通过的平行的出口为15～20°的倾斜部分。使用的喷嘴直径在0.33～1毫米之间。论述了在喷嘴出口下流处的射流静压的测定方法。在测定水射流的切断效率试验时, This paper is about the experimental research on the method of cutting and crushing rock using high pressure water jet. The use of pressure booster up to 630MN / m ~ 2 pressure. The experiment found that the optimum nozzle shape was that the parallel exit through which it was inclined was between 15 and 20 °. Used nozzle diameter between 0.33 ~ 1 mm. The measurement method of jet hydrostatic pressure at the outlet of the nozzle is discussed. In determining the water jet cutting efficiency test,