警察出庭作证是推进证人出庭作证制度完善的重要环节。警察出庭作证不仅有利于案件真实的发现和实体法律的正确适用,而且也是确立司法权威,实现程序正义的需要,因此,应尽快建立警察出庭作证制度。但由于警察身份的特殊性,在警察出庭作证的范围上应有一定的限制。 Police testifying in court is an important part of improving the system of witness testifying in court. The police testifying in court not only helps the real discovery of the case and the correct application of the substantive law, but also establishes the judicial authority and the need of procedural justice. Therefore, the police testifying system should be established as soon as possible. However, due to the particularity of the police identity, there should be some restrictions on the scope of police testifying in court.