Abstract：This article outlines the development of the concept of the 24-hour city in London, expounds the definition, connotation of the night
city. From the perspective of urban design, this article introduces the policy “Developing a night time strategy”, proposeing three
important topics for night-time urban design: improving the city’s night-time legibility, activating the night-time building frontages
and promoting night-time activities. This article introduces the spatial factors and design methods of the three topics. This article
reviews the impact of London’s 24-hour city policies and summarizes the empirical examples provided by London’s practice.