Abstract: The rapid progress of urbanization calls for advanced urban governance models which can improve public safeties and the operational efficiency of a city. Based on urban sensing technology and urban big data platforms, the unified urban governance models connect different systems in different government departments so that the instructions from one department can be directed to other departments. As a result, different government departments can work together to solve a problem which cannot be handled by an individual department. In addition, the unified urban governance models leverage digital twins techniques to bridge the gap between the physical world and the virtual world, enabling government officers to solve real urban challenges just like playing a video game.