Abstract: The subject of this research is the relevant issues of improvements to the mechanism of suspension of a criminal investigation, including assessment of the legal nature of the procedure, content and elements following the decision to suspend a criminal investigation. Among the elements of the subject of this research are the following normative acts: Criminal Procedural Code of the Russian Federation; order of the Investigative Committee of the Russian Federation from January 9, 2017 No. 2 “On organization of procedural control in the Investigative Committee of the Russian Federation”; the order of the Prosecutor General’s Office of the Russian Federation “On organization of the prosecutorial control over the procedure of the preliminary investigation authorities” from December 28, 2016 No. 826. The work yielded new information on the essence and legal nature of the work of investigators and detectives on suspended criminal cases. The author presents the examples and formulates a new definition of the concept of “other procedural activity”, as well as provides new arguments in advancement of the concept of allowability of procedure of investigative actions on suspended criminal cases.