The Economic Zone on the Western Coast of the Taiwan Straits has attracted much attention since the Central Government endorsed its construction and set it as a part of the national strategy. Regional development will depend on central cities and their hinterlands which supply resources for the economic activities of cities, so the reasonable hinterland delimitation and analysis of spatial pattern can not only present an approach for studies on urban economic region, but also provide the basis for regional decision. Based on field-strength model, the paper calculates the urban influence of 20 cities at prefecture level or above in the economic zone in 2007, identifies three strong influence circles of urban agglomeration, and finds out that the big mountains above 900 meters greatly weaken urban influence according to the overlay analysis of urban field-strength and contour line. Furthermore, this paper delimits urban hinterlands in accordance with the principle of "maximal field-strength choice". Then, the spatial pattern of urban hinterlands is discussed in two perspectives. One is the spatial relationship between urban hinterlands and administrative districts, and the other is the spatial relationship between different urban hinterlands. The result shows that Xiamen and Fuzhou in Fujian province, Wenzhou in Zhejiang province and Shantou in Guangdong province occupy much larger hinterland area in surrounding administrative districts due to their higher synthetic strength compared with other cities, so they can play a radiating and leading role in these regions. However, all of the four cities do not cover any inland region in Jiangxi province. At present, there is close relationship between urban hinterlands such as inclusion or semi-inclusion. Meanwhile, the small group and the isolated urban hinterland, geographically apart from the main part, can also be found. Generally speaking, the economic zone has a clear channel to connect the Yangtze River Delta and the Pearl River Delta, but it still needs some time to make achievement in coastal-inland urban hinterland integrity.