Based on the theory of Complexity Adaptive System (CAS), the process of a kind of infectious disease , SARS, from its breakout to tending stable under certain control, is investigated.

• 以复杂适应性系统理论为基本的指导思想,考察了传染病非典型性肺炎(SARS)的爆发流行以及受到控制趋于稳定的过程。