criminal code in 1997 established the special defense right, the purpose of it is to effectively combat serious violent crime, protect the safety of life and property of the people. Although the special defense is a old topic, but the further analysis is necessary. In this paper, starting from the importance of the special defense of independent legislation, reject the point of view to cancel the special defense of independent regulations then blend in the regulation of the defense limit, and at the same time analyzes the subjects of special defense, physical assault, murder, robbery, rape, kidnapping and other serious threat to the personal safety of violent crime, discusses defense problems limit in some circumstance, whether need to reconstruct the burden of proof.