The major stages of the scientific, administrative and social activity of the professor of the St. Petersburg State University Vladinir Daev are described in this article. His most significant scientific works are analyzed from the point of their influence to the modern Criminal Procedure policy, science and practice. The scientific positions of V. Daev regarding the essence and aspects of the procuracy supervision, the functions of the prosecutor in the Criminal Procedure and the adversarial principle are stated in the article. The scientific views of the author regarding the thorough, full and independent investigation of the criminal case circumstances and their influence on the modern legal initiatives are described in the article. The article provides the analyze of V. Daev's works devoted to the improvement of the criminal procedure form and also to the definition, essence and the major aspects of the criminal procedure State policy.