Abstract: For the short term load optimizing strategy problem in the complex power system with multi-type generating sets under the conditions of complex dynamic characteristics,flexible operation conditions and various constraints,a mathematical model with the principle of minimizing operating costs is built and an optimizing strategy based on data storage is designed. On these bases,an integrated software system named ECORUN3.0 is developed which is composed of dynamic property analysis module,data calculation and forecasting module and short term load optimizing module.A numerical simulation is carried out according to the data from a certain power system in north China,and the results show that economic efficiency is significantly increased by using the data storage optimizing strategy.The strategy can provide technical references for the actual optimal scheduling and lay a good foundation for the next step of multi-objective optimization.