By analyzing the phenomena of unbalance between the forecasting results of total demand and sub-demands in the conventional load forecasting， the multidimensional and multilevel feature of load forecasting is revealed. Based on the analysis， the scientific issue of multilevel load forecasting and coordinating is presented along with relevant concepts. Taking the measurement feature of load forecasting models into account， the coordination of multilevel load forecasting is compared with state estimation， which forms the theoretical basis of multilevel load forecasting and coordinating. Based on the classification of multilevel load forecasting and coordinating problems， basic and correlative coordinating models are proposed， and the theoretical research framework of multilevel load forecasting and coordinating is established. It is expected that the study could further develop the basic load forecasting theory and provide useful reference for the industry.