当系统中液压元件运动到某一位置或某一角度时，液压系统中的液压油液将对其产生作用并产生压力或能量流动来完成特定的任务液压系统结构形式可以简单的分为直线运动形式、圆弧运动形式、曲线运动形式等这些结构形式从根本上决定了液压系统工作的复杂性及其对环境影响程度；从根本上决定了液压件在复杂环境中工作时存在着一些缺点或缺陷。
例如直线运动形式主要用于传递能量和动力；圆弧运动时主要用于传递压力；曲线运动形式主要用于传递速度和力矩；曲线运动形式结构简单易于实现自动化；曲线运动量相对较小；在有较高精度要求下，结构简单便于实现控制性能要求，在有足够精度要求情形下可以实现自动控制性能要求；一般使用液压油就可以进行控制；在环境条件较差时使用液压油有利于液压件工作时保持工作稳定；在实际工作中使用液压油不仅可以有效地减少液压件自身消耗，还可以延长液压件使用寿命等作用。
液压液通常分为有机液压液（油）和无机液压液两大类 1、有机液压液 有机液压液是一种完全合成的液压油它有很好的低温性能，具有良好的流动性、剪切性能和抗磨损性其化学成分非常稳定，无气孔，无离子交换反应，水解反应，其质量分数不超过2%(质量分数为5%时一般应超过50%)。
同时这种油液还具有抗氧化和防止水解及防油垢的作用有机液压液主要用于工业生产领域和设备上的各种液压元件工作场所，如：起重机齿轮啮合中起到润滑作用；高速旋转的精密机械中可有效地减少摩擦及防止污染、防止锈蚀、防锈防生锈等。
同时还可以替代传统液压油来使用，降低燃油消耗、提高工作效率因此有机液压液有广泛的应用前景，是目前许多工业设备上不可缺少的优良液压液 2、密封作用 密封是液压件发挥密封作用的重要形式密封元件受到一定压力后，液体从外部进入并且与其相隔离。
液体与内部油液间能进行热量传递从而保证工作温度不超过油温极限以下液体如果受有泄漏的介质影响会发生漏油事故，这种漏油事故会对整个系统产生危害通过机械密封元件可以防止液体泄漏，如活塞或者气缸、活塞环以及密封填料等。
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