The article is devoted to the study of certain issues related to the procedural order of completion of the pre-trial investigation and the latest changes that have been made to the criminal procedure legislation. Some shortcomings of the legal regulation of the researched institute are pointed out, in particular, the order of granting access to materials of criminal proceedings, term for acquaintance with them. Peculiarities and problematic issues of the end of the pre-trial investigation with the use of the information and telecommunication system of the pre-trial investigation are considered. A necessary condition for ensuring the constitutional principle of legality in criminal proceedings is the properly organized activities of the pre-trial investigation, prosecutor and court to establish all the facts of the criminal offense in order to achieve objective truth. Legitimate and reasonable decision-making on the termination of the pre-trial investigation ensures the implementation of the tasks of criminal proceedings, which are provided by Article 2 of the CPC of Ukraine. Thus, the legislator notes that the observance of legal procedure at the end of the pre-trial investigation is one of the main guarantees of protection of the rights and legitimate interests of participants in criminal proceedings. Such protection should take place through the strict performance of their duties by authorized bodies and officials. It has been established that changes in the legislation significantly facilitate the work of the defense and other participants in the process of opening and reviewing the materials of criminal proceedings. In addition, these changes will eliminate the possibility for officials conducting inquiries and pre-trial investigations to make corrections or falsifications of criminal proceedings at various stages of the investigation and after its completion. After all, the main protocols and other procedural documents will be uploaded to electronic systems. Unauthorized interference with the operation of electronic information and telecommunication systems will be punished.