The role of ERP systems in the modern digital economy is considered. The results of work in the field of protection of ERP systems are presented. The architecture and functions of ERP systems that affect their security are determined. The market of ERP systems in the world and the Russian Federation is analyzed. Threats to information security of ERP systems are considered. A model of security threats to the organization’s ERP system is presented. A functional model for determining the composition of the ERP systems protection system is presented. A software package for determining the composition of the ERP systems protection system is described. The results of experimental studies using the developed model are presented.