With the acceleration of China's urbanization process, the long-standing contradiction between population and land use embodied in cities is obviously emerging, while urban land use has been in a super saturated state. The development and planning of high-density cities have become an important research topic in urban planning and geography. As a typical high-density city, limited resources, mountainous terrain, and a large population, has always been a problem in city development of Hong Kong.

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... However, with its high efficiency of urban form in land use, Hong Kong has provided a reference for many cities in the world with the similar situation. Since the 1970s, Hong Kong rose with an astonishing development speed, and succeeded as a worldclass financial center, with remarkable achievement in urban planning, traffic management, environmental protection, and public housing construction. This paper takes Hong Kong as an example, using Kevin Lynch's theory of urban form, investigated in detail the interactive relationship between urban form and urban density, examined the positive relationship between urban form and formation of urban vitality, and argued that high-density urban development meet the cities' own needs, and is closely related to the high efficiency urban form. This paper aims to find the rule of high-density urban form from Hong Kong's urban development for mainland Chinese cities in the New Normal time, and provide references and basis of sustainable urban development in highdensity urban form. 关键词: 活力 ;紧凑城市 ;高密度城市形态 ;凯文·林奇 ;香港