工作油液为一系列油路提供动力源从柱塞泵输入到油路输入，流经柱塞泵的油液与流体有不同压力的油液，是由油液的不同流动方向与流动速度所决定的油在流动过程中与流体产生振动和冲击现象当活塞杆受到压力时，油液在油膜组织内与流体发生混合；当活塞杆受到较大推力并将活塞杆拉出时，由于油膜变形，油液中出现气泡并在流动过程中产生气蚀现象。
另外，由于空气流过油管时也会发生气蚀现象，造成油液的流量减小，同时也造成油液污染油液在流动过程中由于摩擦阻力产生一定程度的能量损耗油液在流动过程中会产生流动阻力，其大小与油管长度和流量有关当油路阻力增加到一定程度，油液流量减小导致油管长度和粘度增加并使能量损耗增大。
同时油液流量减少也会导致油液粘度降低，流体的流动性，导致流体流动速度减慢以及空气流量增加等因素的存在：从而使液体流量减小导致空气流量增加.导致流量减小导致流体温度升高.导致液体损耗增加.导致流体流量减小.导致液压元件中工作油的耗油量出现增加趋势。
液压油的工作介质（油、空气、水甚至空气中的氧）应符合OHSA1461-1999《燃油和气态污染物排放控制标准》的规定，不允许污染环境液压油在实际使用过程中，应满足OHSA1461-1999《燃油及气态污染物排放控制标准》的规定，其总指标小于等于90mg/L时才可使用，当OHSA1463-1999不能满足要求时（如在低粘度、高含硫量或高温度条件下),需更换新油。
而使用新型液压油时应符合下列要求:1、可根据需要选用不同性能的液压元件；2、采用不同压力等级的油管或油盖；3、采用结构合理、密封性好的液压接头；4、在保证高可靠性的前提下尽量选用新型节能型液压油因此，对液压系统来说，液压元件及其配套设备在使用过程中其性能特点与作用十分重要。
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