“无行为则无犯罪”作为刑法格言决定了行为在犯罪构成中具有极其重要的意义,不作为相对于作为而言是一种特殊的行为,促使了行为犯罪理论的不断完善。与作为犯罪相比,不作为犯罪本身有许多特征。本文将从危害行为、作为与不作为、不真正不作为犯以及不作为犯罪的作为义务来源等方面进行分析,以期能对不作为犯罪有一个更为清晰的认识。 “No behavior without crime ” As the aphorism of criminal law, it is decided that behavior is extremely important in the constitution of crime, and omission is a special act relative to it, which promotes the perfection of behavior crime theory. In contrast to being a crime, inaction has many features in itself. This article analyzes harmful behavior, acts and omissions, unaccompanied crimes and crimes of omission as sources of obligations, so as to have a clearer understanding of crimes of omission.