The urban form is crucial to a city‘s sustainable development. For the fast growing larger cities in China, the rapid urban sprawl has obviously caused many problems. In order to find out what is the most suitable form for China‘s cities, I study two extreme urban models: urban sprawl and the compact city. Based on the study and the analysis of particular situations in China, I get the conclusion that compact development is more sustainable for China‘s cities compared with urban sprawl. I consider the ?decentralized concentration? model a practicable way to carry out the ideas of the compact city. In the case study of Beijing, traffic congestion and unreasonable land use are two serious problems which I focus on. The concrete patterns of ?decentralized concentration?-urban villages and transit-oriented city are suggested to solve the present problems and achieve the sustainable development.