This paper, based on Guangzhou's statistic data of productive services and manufacturing in 2010 to 2016, uses gray correlation model to measure the their correlation extents and rankings of different industries of productive services and manufacturing. The results show that information services, research & design and other technical services, and financing service are outstandingly correlated with manufacturing, while power saving and environmental protection, productive lease and commercial services are of low correlation. It is suggested that Guangzhou should abide by the direction of integrated productive services and manufacturing to achieve strong manufacturing city.