The article is devoted to the study of the basic institutional and methodological foundations of the functioning of the defense procurement system during the period of the legal regime of martial law. An analysis of the changes in the regulatory and legal support for defense procurement, which took place during the time of Ukraine's independence, was carried out.
 The algorithm of defense procurement during the period of martial law is schematically depicted and systematized by groups of its main participants - state customers. At the same time, their position within the boundaries of defense, security, information and economic components in the field of defense procurement is substantiated.
 The parameters of the implementation of the procedure for the implementation of the applicable types of defense procurement are summarized, the specifics of the implementation of individual stages of the defense procurement process are specified. It was found that in the conditions of martial law in Ukraine, three actions of defense procurement are used: closed procurement, bidding with limited participation and simplified bidding with the use of an electronic procurement system.
 The evaluation of the most economically advantageous tender offer is automatically most often carried out by the electronic procurement system and is based on taking into account individual criteria (price, life cycle cost, etc.) and the evaluation methodology specified by the customer in the tender documentation. As a rule, the most economically advantageous offer is considered to be either the only one submitted or the one whose price / quoted price will be the lowest.
 The authors identified problematic issues of defense procurement, which made it possible to substantiate a number of important characteristic features of the transformed national system of defense procurement, appropriate for implementation in the conditions of the formation of an increased level of national security risk. Under such conditions, the transformed system of defense procurement should have the following characteristics: quality of provision, completeness of provision, structural organization, competitive orientation, redistribution efficiency, quality management, investment attractiveness, innovative development, international integration, competitiveness, priority integration, synergy of system, adaptability, interoperability. This will make it possible to increase the level of efficiency of the defense procurement system under the conditions of implementation of anti-corruption measures and activation of digital transformation processes.
 Therefore, reforming the defense procurement system is a complex and long-term process that requires the participation of all interested parties. An important step in this direction, among others, is the improvement of procedures for monitoring the execution of state defense procurements.