Most of the existed economic operations of microgrid are using distributed generator (DG) and energy storage unit as controllable devices for optimization scheduling, while there is little focus on load resources management. So that, a compensation model for reducible loads is presented, with four different optimal dispatching models consisting of reducible loads, distributed generators (DG) and energy storage units being built. Taking a typical microgrid system for example, four different optimal models are simulated and analyzed in Matlab environment. The results show that, the microgrid operation cost can be reduced when the two-way interaction between the microgrid and main network is available, and the economy of microgrid operation can be improved greatly with the participation of reducible loads. The optimal model can provide basis for further development of the microgrid. This work is supported by National Natural Science Foundation of China (No. 51207088 and No. 51507100) and Shanghai Committee of Science and Technology (No. 15YF1404600, No. 14DZ1201602, and No. 13DZ2251900).