The invention belongs to the technical field of control of electric systems, is applicable to adaptive control strategy formulation and application under the condition of overload of electric system equipment, and provides a method for estimating permissible current for long-term running of equipment and continuous running time according to current and temperature actual measurement information of the equipment. Control modes are decided according to the continuous running time of the equipment instead of current. On the basis of mixed integer nonlinear programming algorithm, a target function which aims to control the total cost and minimize comprehensive indexes of proportions of load control quantities of different regions is adopted, discreteness and cost of a control measure are taken into consideration, flow restraint of an electric system is measured, an centralized optimization decision and successive approximation control strategy are adopted, coordination to real-time scheduling operation control and emergency control for overload of equipment of the electric system is realized, and problems that scheduling operation control and application time is insufficient, control quantity is insufficient, control cost is over high, load control measures are over centralized and the like are resolved.