有序参量，简称序参量，是描述与物质性质有关的有序化程度和伴随的对称性质。
对于液晶分子取向的有序程度，一般定义为 有序参量(order parameter)，其中长棒状液晶分子的有序参数用S 表示为： 2 1 3cos 1 2 S 式中θ 为分子长轴和指向矢单位矢量的夹角。
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水资源系统是一耗散结构，本文以水资源量作为序参量，来描述水资源系统的有序性和演化方向。
Based on the assumption of water resources system is a dissipative structure, the water is regarded as a sequential parameter to describe the sequence and evolution direction of system.
结果表明，在三光子 参量过程中也存在着一个临界值，即阈值，且当驱动强度超过临界值之后，便呈现出从无序到 有序的转变。
The result shows that there exists a critical value, when the driving strength is over it, the transition from disorder to order will occur.
它认为系统的演化受序参量的控制，演化的最终结构和有序程度取决于序参量。
It considered that the system's evolution was controlled by order parameters. The final structure and orderly degree of the system's evolution were depended on order parameters.
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