证人证言,一直以来都是诉讼中举足轻重的证据种类。但是,证人证言同样存在着不稳定性、可靠性差的问题,便需要合理地分辨可以采纳采信的证人证言,意见证据是不可忽视的问题,英美法系国家对此有深厚的理论基础。本文主要探讨英美法系国家对普通证人的意见证据的详细规定,以期对我国的证据制度带来启示。 Witness testimony has always been a significant source of evidence in litigation. However, witness testimony also has instability and poor reliability. Therefore, it is necessary to reasonably distinguish the testimony of witnesses who can adopt the letter. Opinion evidence is a problem that can not be ignored. Anglo-American countries have a profound theoretical foundation. This paper mainly discusses the detailed provisions of common law witness’s opinion evidence in common law countries, with a view to bringing enlightenment to our country’s evidence system.