In the Criminal Procedure Law of the People's Republic of China (March 2012), it is proposed to explicitly use audio-visual materials as evidence; The Interpretation of the Supreme People's Court on the Application of the Criminal Procedure Law of the People's Republic of China (January 2013) states that emphasis should be placed on the examination of audio-visual materials; If there are doubts about audio-visual materials, they should be appraised; The Opinion on Promoting the Reform of the Criminal Procedure System Centered on Trial (2016.10) emphasizes that from the source of criminal litigation, it is necessary to comprehensively and normatively collect, fix, review, and apply evidence in accordance with the requirements and standards of the judgment, to ensure the fairness and justice of case judgments; The Ministry of Public Security's "13th Five Year Plan for National Public Security Equipment Construction", "Notice on Carrying out the Qualification Determination of Criminal Technology Institutions of Public Security Organs nationwide", "Measures for the Rating of Criminal Science and Technology Offices of Public Security Organs", "Identification Rules of Public Security Organs", etc.