China's total floating population exceeded 245 million at the end of 2013 and is the largest mobile population in the world. This paper explores the spatial distribution pattern and change characteristics of the net floating population at county scale from 2000 to 2010 using census data. The results show the following: (1) the net floating population increased by 120 million over 10 years, and the mobility of the population had enhanced in this period; (2) the floating population migrated to the three economic zones and provincial capital cities, while the traditional agricultural regions with dense populations experienced continuous outflow of population (which altered spatial agglomeration patterns); (3) eastern China has a high level of natural environment suitability and was a major destination area, but more pressures were placed on the carrying capacity of big cities; and (4) western China, with a relatively weak carrying capacity for resources and environment, was a net outflow region in 2010 – although five provinces had small‐scale net inflow because of western‐style development strategies. This study is offered as a contribution to understanding the features of China's floating population and will be useful for those shaping policies that guide population migration.