液压系统的主要工作是液压元件的换向和传递动力其换向过程主要是液压缸内的压力值传递换向过程中活塞和柱塞运动速度较快，柱塞在换向过程中相对运动产生推力，活塞在液压介质中往复运动实现位移，柱塞实现往复运动实现传递能量和动力。
如果油液中存在液体杂质或者受到外界杂质影响，导致介质不均匀受力或者油中杂质过多等因素造成摩擦，会使液压系统产生较大阻力实现换向和传递动力换向和传递动力时必须有油液的存在才能实现 工作压力：液压缸、柱塞等元件在工作中由于受到介质压力的作用能够完成一定的运动工况，其压力通常是液压缸工作时提供给液压系统的最大压力值。
在工作时活塞和柱塞需要承受轴向荷载且不能随意伸缩压力一旦超过压力极限就会发生事故并引起缸体损坏，因此压力一定要保持在一个适当的范围内2、流量：液压缸内液体在静止状态下能以一定速率流动并能通过一个孔径尺寸(mm)来表示流量(L)系数；流量(L)与压力成正比。
3、压力：液压系统中空气或水是不能进行直接液压循环（包括液体循环);液体中不能有气体或水4、耐腐蚀：液压系统有很强耐酸碱性介质腐蚀能力5、导流性能：当液压缸内压力升高或降低时产生阻力以保证缸体内产生较大压力时必须考虑导流槽内泄漏问题。
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