The development of smart grid is the engine driving clean and efficient development of the power system,it also greatly promote the development of the renewable energy,new energy,industry,communication,Internet industry,the related technology and industry innovation. It should stimulate economic growth,lead to a new generation of intelligent life,promote social development. Therefore,making the smart grid planning and construction as a major component part of the energy development strategy in China will be very important. The smart grid is the future for the development of power grid,still need to continue to develop and improve. As the differ in power grid development,power system and national energy resources of every country in goal,it is different characteristics of the smart grid planning in different countries. The smart grid relies on the development of smart grid technology,which includes the information support and decision technology,new transmission technology,system security and stability control technology,intelligent technology,advanced measuring techniques,cloud data processing technology,ect..The new power transmission technology and large-scale renewable energy access and control technology and intelligent power distribution technology are very important parts for the development,realizing smart grid,so,Europe,United States and China attache great importance to develop those intelligent. The development of smart grid will deeply influent the future development mode of power market,and promote the harmonious development of society,economy,the energy industry and the environment. <<