警察作证问题成为刑事诉讼改革的一个重要方面,诉讼法学界对其理论基础及其诉讼价值展开了争论和研究,本文从警察作证的可行性和必要性的角度,阐述了警察作证的理论基础主要有公正审判理论、检警关系理论、非法证据排除规则以及传闻证据排除规则等。同时,指出了其作为庭审改革重要内容具有重大的诉讼价值。 The issue of police testimony has become an important aspect of the criminal procedure reform. The field of litigation jurisprudence has debated and studied its theoretical basis and litigation value. From the perspective of the feasibility and necessity of police testimony, this paper elaborates the theoretical basis of police testimony There are fair trial theory, the relationship between the prosecutor and police, the rules of exclusion of illegal evidence and hearsay evidence exclusion rules. At the same time, it is pointed out that it has significant litigation value as an important content of trial reform.