Regional economic growth disparity is the focus of scholars. In this paper，Family of Generalized Entropy measures and Theil Index are used to measure regional economic growth disparity in Beijing-Tianjin-Hebei Metropolitan Region from 1993 to 2003. Some conclusions are drown as follows： Firstly，When calculating economic disparity, different spatial unit gets different result in the same years and the same measure indices. At the same time, with different time to calculate economy disparity, the result is different in same measure indices. Secondly，from time sequence，the trend of regional economic growth disparity is earlier decrease then enlargement，and the spatial disparity represents between north-west Zhangjiakou-Chengde region and Beijing- Tianjin-Tangshan. Thirdly，the reasons contribute to regional economic disparity include natural condition, total investment in fixed assets, foreign direct investment and labor efficiency.