我国是海洋大国，有相当陆域国土面积三分之一的海洋国土。随着海洋资源的开发利用，海洋经济不断发展，海洋经济区逐渐形成。在全国划分经济区时，不应忽视海洋经济区。沿海省区在划分经济区时，更应把海洋列入到省级经济区内。辽宁是我国沿海省区之一，通过对辽宁海洋经济区划分的研究，探讨海洋经济区及其划分的有关理论、实践与方法。

China is a country with vast seas. Along with the exploiting of marine resources and the developing of marine economy, marine economic regions are being formed in China. According to the main ideas, the regionalization principles and the index systems of the division of MCER in Liaoning, one of the coastal provinces in China, for the following two MCER at the first level and four MCER at the second level can be defined: Ⅰ Marine comperhensive economic region of the northern YellowSea.Ⅰ-1 Dalian marine economic region of the southern Liaoning peninsula.Ⅰ-2 Dandong marine economic region of the northeast of Yellow Sea.Ⅱ Marine comprehension economic region of the Bohai Sea Liaodong Gulf.Ⅱ-1 Yinkou Panjin marine economic region of the northeast of the northeast of the Liaodong Gulf.Ⅱ-2 Jinzhou jinxi marine economic region of the southwest of the Liaodong Gulf.