Due to the special background of law in china and the defect of the theory of special prevention,special prevention theory not only lacks base but also depart from the direction of law.

Only intensifying the common defense and adopt humanistic special defense of the female crime,can we keep it within limits in effect.

The aim of penalty should be adherence to taking general prevention against crimes as the core while taking account of refribution and individual prevention and realisation of the unity of the two.

This paper analyses the causes of special defence system and puts forward that Item3,Article 22 of Criminal Law the using of the word “going assault”is not scientific and it should be“intentionally injure”.

The article studies and explores the two new questions in the cognition of justifiable defence, that is, the limit condition of (common) justifiable defence and the issues of special defence in the light of the new provisions of justifiable defence in the new Criminal Law.

However,in China the causes and limitations for justified defense are not clearly defined,and the stipulations on special defense are even less accurate.

In order to encourages the citizen to struggle well with the illegal criminality, also in order to meet the reality social need, our country regulations special defense system in criminal law in 1997.

This article is about special defense, and adds up to more than 40000 words.