Based upon the location quotient,the index of revealed comparative advantage and Krugman specialization in- dex,the paper explores the location and regional specialization of China's various service sectors in six most developed provinces or municipalities,namely Beijing,Shanghai,Shandong province,Jiangsu province,Zhejiang province and Guangdong province.It's found that (1)the differences on the whole service industry about the six cities have the trend of extension.As for various service sectors,inter-provincial differences becomes smaller in traditional service sectors, while inter-provincial differences becomes larger in newly arisen service sectors.(2)Beijing and Shanghai's regional specialization are all very high.(3)Jiangsu and Zhejiang province have the same industrial structure in a lot of service sectors