To commence from the basic theory of system to analyze causes and illustrates that generation of postpartum depression are multifactorial result, which is the reciprocal restriction and coordination.

• 用系统论方法分析产后抑郁症相关因素，论述产后抑郁症发生是由多方面因素引起，而各因素之间是相互制约、相互作用的。