2. In view of the introduction of adversary system in the revision of 1996 Criminal Procedure Law and the extremely low witness attendance rate in China, Professor Gu Yongqiang wrote in 1999 that it is neither possible nor necessary for all witnesses to testify in court, and China should establish a system of key witnesses to testify in court.
3. Focusing on the meaning of judicial justice, Professor Gu Yongqiang wrote in 200 1 and 2002 respectively that the comparison and coordination between cases is an important aspect of substantive justice of criminal justice, and criminal trial activities should attach great importance to this issue.
4. In 2004, in view of the problems existing in criminal defense, especially pretrial procedure in theory and practice, legislation and judicature, Professor Gu Yongzhong wrote that the right of defense is fundamentally the right of every citizen; Defense refers not only to substantive defense, but also to protect the personal rights and litigation rights of criminal suspects and defendants from infringement during criminal proceedings, so it is pointed out that "from defense in trial to defense in investigation". In the same year, Professor Gu Yongzhong also undertook the national social science fund project: International Standards of Criminal Defense and Research on China and criminal defense system, and the results were published in Volume 16 of Criminal Law Review in 2005.
5. In 2005, in view of many problems existing in criminal investigation activities in China, Professor Gu Yongqiang actively organized and participated in the pilot activities of establishing the system of on-the-spot interrogation and audio-visual recording of criminal suspects' lawyers. Combined with China's reality, it is urgent to establish the system of on-the-spot interrogation and audio-visual recording of criminal suspects' lawyers in a certain range.
6. Combining the practice experience of criminal defense lawyers, according to the actual situation in China and the relevant criminal justice standards of the United Nations, Professor Gu Yongzhong made a comprehensive analysis and evaluation of the current situation in criminal defense system in 2006; On this basis, the author puts forward systematic thoughts and propositions on reforming and perfecting criminal defense system in China, including concrete opinions and suggestions on strengthening the defense of death penalty cases.
7. In 2005, the Litigation Law Research Center of China University of Political Science and Law cooperated with Haidian Branch of Beijing Public Security Bureau, Jiefang Branch of Jiaozuo Public Security Bureau of Henan Province and Baiyin Branch of Baiyin Public Security Bureau of Gansu Province to carry out the project of "Establishing the system of interrogating criminal suspects with lawyers present, audio and video recording (for trial implementation)". From July to August, 2006, the research group was divided into four groups and went to Zhejiang, Heilongjiang, Anhui, Xinjiang and other four provinces to carry out research activities on the reform of investigation and interrogation procedures. The research results were published in the fourth and fifth issues of China Lawyer in 2007. In addition, Professor Gu Yongzhong also undertook the major project of "Research on the appearance of prosecutors in second instance" entrusted by the Supreme People's Procuratorate, and the research results were published in Procuratorial Daily (April 28, 2008) and China Judiciary (No.10, 2008) respectively.
8. In 2007, Professor Gu Yongzhong thought deeply about the construction of conditional non-prosecution system in China. He made a logical analysis from the perspectives of the relationship between the case of conditional non-prosecution and the case of the defendant pleading guilty, the significance of the conditional non-prosecution system and the necessity and legitimacy of establishing the conditional non-prosecution system. It is imperative to establish a conditional non-prosecution system in China.
9. On June 1 2008, the new Lawyers Law was formally implemented, but there are many problems in judicial practice that need to be solved urgently. In order to solve this problem, Professor Gu Yongqiang first talked about the social responsibility of defense lawyers to maintain social fairness and justice, and then extended to the urgent need for the reform and improvement of China's defense system, focusing on strengthening the protection of defense lawyers' rights in pre-trial procedures.