The rule against hearsay is the extremely important rule in the English-America legal system of the evidence law, it has the glorious history, whose evolution and development inflect the basic characteristic and the tendency of the common law.

The rule against hearsay is that hearsay can not be adopted unless other rules are prescribed in law.

The definitude of the scope and concept of hearsay evidence is the prerequisite of the apply of the hearsay rule correctly.

On the advantages and disadvantages of American exclusionary rule and its teaching;

The comparative study of American exclusionary rule and Germany rule of evidentiary use prohibition;

Comparing German and American Exclusionary Rules——The Experience of China s Establishing Criminal Evidence Rule;

The exclusive rules of illegal evidences are the most important aspect of the law.

The establishment of exclusive rule of illegal evidence is one problem that chooses value between punishing crimes and ensuring human rights, entity and procedure just in fact.

To establish a comprehensive exclusive rule of illegal evidence has become a worldwide tendency with the development of procedual democracy.