Abstract: The Pearl River Delta is the frontier region of Chinese economic reform and opening up. To some extent, although the economy has gained rapid development, the level of regional economic difference has gradually increased. Therefore, taking in nine cities of pearl river delta urban agglomeration as the research object, selecting 18 regional cities with smaller economic development gradient difference as sample data, the level of economic capacity the pearl river delta urban agglomeration and internal nine big city from 2005 to 2014 is tested after using revised model measure, and the spatial difference of economic bearing capacity is analyzed. It is concluded as follows：Firstly, the economic bearing capacity of the pearl river delta urban agglomeration tend to be small fluctuations, but, the interior of the urban agglomeration, polarization effect is very significant; the trickle-down effect is still in the lower levels, and the trickle-down effect is still at the lower level. Secondly, internal urban agglomeration, the level differentiation bearing capacity of urban economic level is very serious, formed in Shenzhen, Guangzhou, Zhuhai and Foshan as the first level, Dongguan and Zhongshan to the next level, Huizhou, Jiangmen and Zhaoqing took three to five levels of economic bearing capacity rating system. Thirdly, the three core area is formed including Guangzhou, Shenzhen and Zhuhai, and the changing trend of three regional’ economic bearing capacity level is Guangzhou-Foshan-Zhaoqing (Guang-Fo-Zhao), Shenzhen-Dongguan-Huizhou(Shen-Guan-Hui), and Zhuhai-Zhongshan-Jiangmen(Zhu-Zhong-Jiang) in the geographical space. Finally, for nearly 10 years, the carrying capacity of the pearl river delta urban agglomeration in east area is higher than the western, and the shadow effect of west bank collapse is significant.