Energy security is an important part of national security，and the security of coal，coal and electricity supply is the “ballast” and “stabilizer” to guarantee energy security. In this paper，in view of the new situation of accelerated adjustment of international energy pattern，accelerated construction of new power system，and increasingly tight supply and demand of energy and power in recent years，the early warning system of coal，coal and power supply and demand guarantee in Henan Province is studied and constructed around the theme of advance warning. The early warning system focuses on the chain of “coal supply and demand - coal and electricity operation - coal inventory”，focuses on coal，coal and electricity，and two key points in the short term during the year，and builds two levels of primary and secondary warning indices to achieve advance warning on a time-scale，which can be used for The system is designed to provide time and reference for the development of power operation plans and the planning of security and supply. Based on the early warning index system，the current characteristics of energy and electricity supply and demand are analysed，and countermeasures and suggestions are put forward with a view to enhancing the ability of energy and electricity to ensure safety and supply.