There are three coherence theories in legal field:coherence in legal argumentation,coherence in legal system,legal coherentism,which combined can analyze judicial practice well.

The realization of harmonious verdict needs coherent legal argumentation.

Aristotle s Rhetorical and Legal Argument;

From the judicial perspective ,legal finding, legal interpretation,legal argument,balance of interests,legal reasoning and relevant law theory formate the system of legal methodology.

As a new domain of today s jurisprudential study,legal argument is characterized by its objective,dialogue,communication,reasonableness,and practice,etc.

Whereas legal demonstration theory, emerged after 1970s, is a new trend of thought in legal theory, which is the result of the development of a particular academic thought.

However,when the case was rather complicated and difficult,interpretation could not help due to the gap between facts and rules,legal reasoning is necessary; and legal demonstration means to choose among multi-level understandings of law as a deeper level activity in understanding law.

In the development of abstract legal theories after World War Two,the theory of legal argument based on modern logics,rhetoric of language philosophy and discourse theory sprang up in the field of philosophy.

Re-Criticism of Fundamentals of Legal Argumentation;