In order to design the electricity market system in China， the following issues have to be considered;（Ⅰ） the market development must be in line with the progress of domestic economical and political reforms，（Ⅱ） the stage of domestic economic development，（Ⅲ） coordination with the optimal resource allocation and the equity allocation， and（Ⅳ） follow the overall efficiency of the industrial chain associated. Under the background of China's aggressive plans toward electricity market construction， the paper analyzes the basic situation to design China's electricity market system mode， pointing out that the electricity market construction is impossible to surmount the reform progress and economic development stages of China. The electricity market system mode is impossible to be settled at one go and must have a transformation period（transfer mode）. Meanwhile， the international experience and basic principles of the electricity market system mode design are analyzed. The 8 different types of structures and 8 coordination models to the electricity market system mode of China are given on the basis of the interconnected power network of China. The 10 kinds of electricity market system modes are put forward and the applicability to each market system mode is analyzed.