Smart grid has attracted much attention all over the world.The new energy economy era as represented by smart grid is approaching. As a vast complex system， smart grid concerns many kinds of factors， such as technological， economical， social， environmental ones which interact with one another. The main features and aims of smart grid are summarized. Considerations of smart grid plan and construction in China in the perspective of economics are given. Preliminary discussion on smart grid is presented to hope be helpful for the smart grid development from five aspects， i.e. the cost-benefit analysis， the technology innovation， technology transfer and technological capability， enterprises-universities-researches cooperation， the efficiency and system reform of electric power， the evolution and devise of smart grid.