In plan economy period,dual census register system is regarded as the basis of population stratum management,as a result,a series of unfair income distribution policy is gradually formed between urban and rural areas.After reform and opening to outside world,this unfair income distribution system has not been gradually reformed,and so the urban census register system becomes a kind of goods and the cities use the census register to obtain benefit,and,meanwhile,the cities refuse to make income re-distributio...