Along with the science and technology progress and widely used to deal with the challenges facing the city development，"Smart City" came into being. In modern society, "Smart City" becomes the future trend of city development. Urban planning, as an important public policy of controlling land and space resources, should converge with "Smart City". Base on the concept of "Smart City", this paper research on changes under the background of "Smart City" construction, and then study on ways to reform from the perspective of urban planning. Preliminary form China's urban planning related theories. "Smart City" is a brand-new concept proposed by IBM in the context of globalization, against social change, technological development, market practices and global issue; it provides means to address the challenges facing China's urban development. In China, "Smart City" construction is blossoming everywhere. But still in the initial stage and has a long way to go. In such context, investigation into revolution and ways to reform from the angle of urban planning is of great significance.