不作为犯的作为义务来源中,先行行为是一重要来源。对于先行行为的范围,在刑法理论上存在先行行为的性质是否仅限于积极作为、合法行为等争论。本文在考察了各种相关观点后,认为先行行为不仅限于积极作为,也可以是不作为;可以是合法行为,也可以是犯罪行为。先行行为是引发不作为的原因力,从而确定不作为的责任主体。对于先行行为引发不作为这一过程,不要求行为人对此有过错认识。 Inaction as a source of obligation, the first act is an important source. For the range of precedent behavior, the nature of the precedent behavior in the theory of criminal law is confined to the controversy such as active act and legal act. After examining all kinds of relevant views, this article argues that antecedent behavior is not limited to positive behavior or omission; it can be a legal act or a criminal act. Preemptive behavior is the cause of non-action, thus determining the main responsibility of omission. It does not require the perpetrator to have a fault understanding of the process of initiating misconduct.