On the basis of forecasting mid-long term electricity consumption demand in China, power supply capacity, including supply capacities of coal-fired power, hydropower, nuclear power, non-hydro renewable resource power and gas power, was analyzed. The principle and purpose for developing mid-long term power supply pattern were expounded, and mid-long term power grid pattern is proposed.Finally, it was indicated that mid-long term electric power development strategy in China need some new power technologies, such as intelligent power distribution and utilization, intelligent power dispatching, large scale energy storage, superconducting power, distributed power supply, etc.