After economic reform and open-door policy in 1978, China has been showing rapid economy growth, but there are many concerns about regional inequalities. In this study, we discuss the regional development policies and estimate the trends of regional income disparity, using Gini Index and regional income data(per capita GDP) of the National Statistical Bureau of China from 2000 to 2009. This paper shows that the regional disparity in China has been in relative decline trends since the beginning of the 2000s. However, The Center and North-east region showed an increasing trend according to the analysis of weighed coefficient of variation among different provinces, while The East region being a decreased tendency after slight increase in 2003. This result indicates although the regional balance development policies has been taken, China is still in regional inequalities state. We also find that the fact of the decline trends of regional disparity in the 2000s is agreed with other research. More further researches are needed to generalize the evolution of regional income disparities and hypothesis.