One of the important issues of generating schedule is how to implement the sorted table of generating units. An algorithm for dispatch schedule is proposed. The algorithm is implemented by following steps: Firstly， according to the load forecast over the whole and region power grid， associated with the sorted table of the energy saving generation， the operating mode is determined; and then the equal incremental principle is employed to deal with economic dispatch problem. By introducing the utilization coefficients of generating units， outputs of generating units， which meet the demands of load level， system security， and operating constraints， are obtained. The proposed algorithm is validated on Jiangsu power grid. In this system， a majority of generating units are thermal units. The results of case study show that the algorithm is reasonable.