The traditional way to test the authenticity of testimony is through the witness extrinsic behavior and facial expressions.

The regulation of witness and testimony plays an important role in the standardization of a civil suit, m which many problems of shortage have bee exposed with the deep going imporvement of the method.

To compare the mainland legal system to British and American legal system expert testimony evidence ability and the certificate strength,it analyzes conclusion of legal appraisal ability and the certificate strength in our country.

The accessibility of expert testimony in the US has experienced from restriction on Frye s formula of "general acceptance" to the legislation expansion of "relevance" and "reliability" by the Federal Rules of Evidence, generating the Daubert s formula for "comprehensive observation" , which was then challenged by the cases of "Joanna" and "Kumho Tire" .

The solution is inducing expert testimony into litigation proof system, i.

Since early 1980s? legal social psychology research in America has got a lot of new fruits in many aspects such as the study of jury, testimony, public attitudes toward crime, and so on.

The aim of the testimony system is to discover the fact that happened previous.

Witness testimony is regarded as one of the evidence types in criminal suit,which often plays an important role in asserting the fact of case.

As one of seven kinds of evidence in civil action evidence,witness testimony reflects the fact of the case most directly and vividly.

This paper makes a comparative analysis of the practicability and related test measures of witness testimony in criminal lawsuits in China and Britain.