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本文提出了系统非变阶及结构渐近稳定的概念；并且还给出了系统非蜕化性的确切的定义。在这基础上，给出了系统在串联、并联及反馈时构成的复杂系统的非变阶条件和结构渐近稳定的充分必要条件。 利用上面的结果，成功地分析了结构无静差问题的非蜕化条件；证明了非蜕化条件不但是实现结构无静差的充分条件之一，而且还是实现结构无静差的必要条件。从而，把对结构无静差的研究又向前推进了一步。
In this paper, the concepts of non-variable order and asymptotic stability of the system are proposed. The exact definition of nondegenerate system is also given. On this basis, the necessary and sufficient conditions for the non-invariant conditions and the asymptotic stability of the system in complex systems composed of series, parallel and feedback are given. Using the above results, we successfully analyze the nondegenerate conditions for the problem of no static difference in the structure. It is proved that the nondegenerate condition is not only a sufficient condition for the realization of the structure without static difference, but also the necessary condition for the realization of the structure without static difference. Thus, the study of no-static structure is one more step forward.