The floor-area ratio is a key indicator in developing urban space, which in China's most newly constructed city areas is relatively low. ANBOUND agrees that building GREAT city via promoting floor-area ratio is considered to be an effective mean to manage the utilization rate of urban space well, but the environment quality can not be the victim. The city planner should value the key factors on sustaining the healthy development of city, namely, integrating the comprehensive utilization of land and high-rise buildings, and regulating the space development based on strategic plan.