The record of appraisal shall be signed by appraisers, witnesses and investigators. According to different appraisal standards, appraisal can be divided into different types. 1, according to different objects, it can be divided into personal identification, photo identification, object identification, place identification and corpse identification. 2. According to different recognition methods, it can be divided into "one-to-one" recognition and mixed recognition. Among them, mixed identification includes mixed identification of photos and articles and identification of suspects in line. 3. According to the different identification subjects, it can be divided into victim identification, criminal suspect (defendant) identification and witness identification. 4. According to different identification stages, it can be divided into investigation identification and court identification. The appraisal record has always been used as evidence, but it is not clear what form of legal evidence it belongs to. Some people think that the victim identification record belongs to the victim statement, the criminal suspect identification record belongs to the criminal suspect confession, and the witness identification record belongs to the testimony. The new Criminal Procedure Law defines the identification record as an independent form of evidence. Although identification, as an effective method of proof, is widely used in investigation and trial practice, and identification record, as a legal type of evidence, is also confirmed by the newly revised Criminal Procedure Law, the norms of identification procedure in China's legislation are lacking. There is no relevant provision in 1996 Criminal Procedure Law, and there is no basis for identifying people and things in practice, which leads to different methods of organizational identification of investigators, and the identification results are arbitrary and lack of objectivity. In order to make up the legislative blank, the Ministry of Public Security and the Supreme People's Procuratorate have made corresponding provisions on the appraisal procedure in the Provisions on the Procedures of Public Security Organs Handling Criminal Cases and the Rules of Criminal Procedure of People's Procuratorate respectively.