According to requirement on seal of hydraulic cylinder, the paper describes the way of sealing the hydraulic cylinder, the properties and parameters of Yx-type seal ring and K-type dust seal, the procedures of reliesing back pressure.%本文根据液压缸的密封要求，阐述了液压缸的密封方法。并着重叙述了液压缸动密封装置Yx形密封圈的性能特点、参数选择、起保护作用的K形防尘圈以及释放背压的措施。
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