From the perspective of city organization and integration in urban system, this paper finds obvious inverted Ding(丁)-shape pattern of urban hierarchy in China, which contains six classes. While a few metropolises with strong national or regional influence lead other cities at top, a large number of ordinary cites gather at the bottom of urban hierarchy. The historical process, development strategies, promoting-model of China’s urbanization, household register system and other factors jointly contribute to this. However, this pattern may cause problems to both super cities at top and weak cities at bottom, so it is crucial to change the policy of household registrations at big city level and focus on the development of regional and provincial cities, which may not only make a healthy urban system but also promote dynamic interactions between cities at different levels of urban system.%基于城市组织和整合的新视角对我国城市系统进行层级分析，发现我国城市系统明显呈“倒丁字型”格局，即少数顶层城市中心主导绝大多数其他城市，而大量功能弱势城市集中堆积在城市系统的底部，其中主要包含六大城市层级。我国城镇化的历史进程、发展战略、推动模式、户籍政策等因素，共同塑造了这种格局。鉴于该格局容易导致大城市病与小城市动力不足，我国亟需调整大城市的户籍制度，大力发展地区性和省级城市中心，以优化城市层级格局，进而促使不同层级城市间的良性互动。
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