Due to China's large population and area, the administrative divisions of China have consisted of several levels since ancient times. The constitution of China provides for three de jure levels of government. Currently, however, there are five practical (de facto) levels of local government: the provincial (province, autonomous region, municipality, and special administrative region), prefecture, county, township, and village.
Since the 17th century, provincial boundaries in China have remained largely static. Major changes since then have been the reorganization of provinces in the northeast after the establishment of the People's Republic of China and the formation of autonomous regions, based on Soviet ethnic policies. The provinces serve an important cultural role in China, as people tend to identify with their native province.
More information on the Wikipedia page [1].