Based on the national statistical data，the change of wage income gap in China since reform and opening up is analyzed and the current situation of wage income gap between regions in 2017 from multiple perspectives including the wage income level，wage growth rate，urban private-owned enterprises and urban non-private-owned enterprises is analyzed in detail in this report. The study results show that since reform and opening up，the wage income gap between regions of China has been wavelike widened gradually，presenting a centralized and solidified tendency in high-wage regions and low-wage regions. The reasons for regional wage income gap are related to the imbalance of economic development，the difference in factor endowment，the labor flow barriers and market segmentation，the degree of opening up，the degree of industry agglomeration and the policy system between different regions. For the alleviation of regional wage income gap，the effective measures are must be taken at the height of economic development strategy to promote the coordinated and balanced development of economy and society between regions，so that the problem of regional wage income gap could be solved fundamentally.