The article is devoted to the characteristics of the security order as one of the acts of the Constitutional Court of Ukraine and the practice of its application. It has been noted that the introduction of this executive document into the practice of the body of constitutional jurisdiction is due to the beginning of the functioning of the institute of constitutional complaint in Ukraine. Also it has been noted that the basis for securing a constitutional complaint is the need to prevent the irreversible consequences that may occur in connection with the execution of the final court decision. The way to ensure a constitutional complaint is to establish a temporary ban on certain actions. The article analyzes the first security order of the Constitutional Court of Ukraine and highlights the debatable issues that arose after its publication. Particular attention has been paid to the study of the most significant problems related to the legislative consolidation and functioning of the institution of the security order. The issues concerning the authorities of the Constitutional Court of Ukraine authorized to issue a security order have been analyzed. It has been stated that, along with the Grand Chamber, it is expedient to grant this right to the Senate, as they are the main subject of consideration of constitutional complaints. The boards are invited to give the right to take an immediate initiative to the senates to resolve the issue of issuing a precautionary order in case of sufficient grounds. The problematic aspects of the current legislation on the formulation of the grounds for securing a constitutional complaint have been identified. Such a feature as the "irreversibility" of the consequences as the basis for issuing a security order is considered. In analyzing the consequences of the execution of a court decision from the point of view of its reversibility, attention is paid to the intermediate nature of such consequences, is partially reversible. It has been recommended to grant the subject of the right to a constitutional complaint the right to apply to the Constitutional Court of Ukraine with a corresponding petition to secure a constitutional complaint. During the disclosure of this issue, the relevant bills aimed at improving the legal nature of the security order in the practice of the Constitutional Court of Ukraine have been analyzed. It has been noted that the institution of the security order of the Constitutional Court of Ukraine needs further research, substantiation of key aspects of the relevant legislation and appropriate practical application.