With the development of global urbanization,the rapid growth of urban population has become increasingly evident. Since urban population in 2009 was more than 50% of the world's population for the first time,Ban Ki-moon,Secretary-General of United Nations,has said that the world has entered the era of the"urban century". The rapid growth of urban population has led to urban construction quickly,and took more social problems happened. Urban managers launched New City movement and urban renewal activities. In this process,there are many new ideas and new designs to be created,and smart / digital cities become the first choice for future urban development. The paper introduced different content of digital city and digital society,and analyzed different functional modules in the construction of digital city. <<