Smart grid is a modern grid that integrates the development of science and technology with high-tech equipment. It integrates the traditional power system, increases the security performance of the grid and improves the quality of power supply. Compared with traditional power grid, smart grid can carry out self maintenance and recovery, and also can store energy in current transmission. Interactive communication between suppliers and users can be achieved through smart grid. In summary, the smart system under the smart grid greatly improves the stability between power transportation and transmission, and reduces the power loss.