Abstract: This paper shares relevant experiences and insights in the electrical design technology of existing hotels based on ultra-low energy consumption renovation. Through the synergy of core systems on the logic of energy consumption optimization and by taking advantage of various system technical measures, ultra-low energy consumption operation is realized. The specific content includes the building equipment automation systems, Direct Digital Controllers (DDC), distributed control systems, power distribution and metering monitoring systems, photovoltaic power generation monitoring and control systems, intelligent lighting systems, as well as energy management systems.