To solve the complex problem brought by coordination mode between the programming of generation schedule and real-time control， a day-ahead and real-time generation schedule model is developed first based on the basic objectives， guidelines and related constraints for energy-saving generation dispatching. On this basis， four coordination models for day-ahead generation schedule considering energy saving and real-time control are proposed. The four modes are also analyzed with regard to the goal achieving of energy saving， the influence on system security， the demand on scheduling technology， and other aspects. Then， proceeding from the time scale and target dimension， the similarities and differences of four coordination models in the process of generation schedule development are qualitatively explained. Finally， a 10-unit 24-hour system is used as an example for quantitative calculation of the energy saving effect of four coordination models with the load forecast deviation as the starting point.