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Problem statement. Currently, the problems of optimizing the working hours of the investigator (inquiry officer); the prosecutor as a supervisor of pre-trial proceedings; investigating judge during the pre-trial investigation in criminal proceedings, a significant part of which is document flow, remain unresolved in Ukraine. During the pre-trial investigation, the potentials and functionality of electronic systems or databases are not fully applied due to insufficient incorporation of provisions on electronic proceedings, including electronic document flow, into the criminal procedure legislation. The purpose of the work is to improve electronic document flow during the pre-trial investigation in Ukraine as an element of the criminal procedural form. The methods applied are comparative legal – to compare and contrast electronic forms of the document flow in Ukraine and abroad; technical legal – to define legal provisions establishing the bases for electronic document flow in Ukraine; logic method and the method of system analysis – to develop proposals for the improvement of electronic document flow in Ukraine. Results. It is proposed to change the provisions of the Criminal Procedure Code of Ukraine, revealed in amendments to Articles 36, 40, 40-1 of the Code, regulating the powers of the investigator, inquiry officer, prosecutor in terms of establishing the procedure for filing a motion on security measures, or investigative (search), covert investigative (search) actions. In addition, it is proposed to supplement Articles 99, 110 of the above Code, as well as paragraph 3 of the Regulations on the Unified Register of Pre-Trial Investigations, with provisions that will facilitate the initiation of electronic document flow during the pre-trial investigation. Conclusions. Considering the increase in document flow between the investigator (inquiry officer), prosecutor as supervisor of pre-trial proceedings and investigating judge in the criminal proceedings of Ukraine since 2012, and the optimization of such activities is required, including through electronic document flow as the latest criminal procedural form.