介绍了以普通水作为传动、支撑推进、排屑和润滑介质的环境友好型全水压凿岩机；建立了以弹性杆、弹簧为基本单元的冲击凿岩机 波动力学模型；对YST–25全水压凿岩机进行了动态数值仿真与分析。研究结果表明：活塞最大压应力为102 MPa，最大拉应力为28 MPa，满足 了强度设计要求；钎杆中的应力比活塞的大；尽量减小活塞的截面积变化有利于延长活塞寿命；为了保证凿岩速度和能量传递效率，YST–25凿 岩机宜于在中硬到硬岩中钻进。这为环境友好型全水压冲击凿岩机的改进设计和效能评估提供了依据。

In this paper,  an environmentally friendly hydraulic percussive drill is introduced,  in which water is used to perform all function of the drill,  such as energy transmission,  push,  chip removing and lubrication.  Then,  dynamics of the percussive drill is modeled by means of elastic bars and springs,  and microcomputer simulation of YST-25 environmentally friendly water hydraulic percussive drill is performed.  The performances of YST-25 environmentally friendly water hydraulic percussive drill are evaluated.  The result indicates that piston meets intensity design demand,  maximum compressive stress of which is 102MPa and maximum tensile stress is 28MPa.  The stress of drill rod is bigger than that of piston.  To reduce the variation of sectional area is helpful to elongate the life of piston.  YST-25 drill is more suitable to drill medium or hard rock so as to keep synthetically both drill speed and energy transfer efficiency.  The suggestions can improve the design of environmentally friendly hydraulic percussive drill.