In the high energy consumption enterprises, systematic model controlling technology is used for saving energy. Electrical energy consumption of enterprise is divied into some units, and the object function model of electricity consumption of the units is constructed. The individul object function values of the units are the most important variants in the enterprise´s system object function. The object function model of the enterprise´s electricity consumption is constructed. Based on them,the optimum calculation and control are done to realize the minimum of the enterprise´s electricity consumption.