A Overview of Reason of Income Gap Changes of Residents Since the reform and opening-up

There has been a continuous rapid economic growth in China since opening-up in 1978,and meanwhile,the income gap of residents has also been continuously getting larger and larger.At present,the income gap has already risen to a higher level.In this paper,on the basis of related research,we make a study on the reason of income gap changes since the reform and opening-up,and the reason includes three aspects,that is,factor of economic development,factor of system reform,and governmental policy.And finally there is a brief conclusion.