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机构的瞬时运动可以用螺旋与螺旋系描述。构件通过运动副联接成机构时，具有串联与并联两种基本形式。本文给出了构件在串、并联两种形式时的螺旋系和螺旋系阶数的几个关系定理，并举例说明了它们在机构运动分析中的应用。
The momentary movement of the body can be described by the spiral and spiral system. When the components are connected into the mechanism through the movement pair, they have two basic forms of series connection and parallel connection. In this paper, we give some theorems about the relationship between the order of the spiral system and the spiral system when the two components are connected in series and in parallel, and illustrate the application of them in the mechanism motion analysis.