The conflict of obligations in criminal law is a branch of excluding criminal subject in criminal law’s theory of continental law system,and it could be understood from both aspects of legal facts and legal evaluation.

when one s duties conflict, law can not force one to do thing which he is unable to do.

And conflict of duties is an important issue of this field.

This paper mainly focus on the conflict of duties in criminal law started as the center argues that the full text of the sub-chapters, about 32,000 words.

There exists an obligation conflict objectively in the realistic socie ty, although it is rarely involved in the theory of our country s penal code.

The obligation conflict in criminal law is one condition of that the behavior perform several numbers obligation at the same time ,but he can only perform one of the obligation and violate others,and can not be punished in criminal law.

By analyzing the origin and main types of these obligation conflict problems,the article proposes for the first time that the deontic reasoning\'s reasearch should unify with the pragmatics and sets up many kinds of types deontic reasoning system,which is helpful of causing the research results of the deontic reasoning to advance the legal science practice domai

Therefore, it is of great importance to understand legal duty and legal duty conflicts from the perspective of identity.