Abstract: Residential land is the most important input factor in the real estate development. The quantitative measurement of buyer concentration in the residential land market is the key to accurately grasp the status quo of industrial structure of the real estate developing industry, so as to promote the supply-side structural reform of urban housing markets and scientifically formulate the industrial policies for the real estate developing industry. This study makes use of both the big data resources, i.e., the land leasing bulletin and the business enterprises registration, and accomplishes for the first time the quantitative measurement of the city-level buyer concentration ratio of the primary residential land markets in 286 cities from 2008 to 2017. The research results show that China's urban residential land market has actually reached a very high buyer concentration degree, which has still been keeping a fast increasing trend in recent years. Up to 2017, over 70% of the sample cities could be identified as some kind of oligopoly markets, and the concentration ratio is especially high in the cities in the western region and the third and fourth-tier cities. It has become a top priority to re-examine and reasonably adjust the current industrial policies for China's real estate developing industry.

Key words: real estate developing industry, buyer concentration ratio, residential land, industrial policy