Globally, coastal ecosystems are among the most intensively used and threatened natural systems which is acting on numerous critical benefits (i.e. ecosystem services) that are of great importance to the Earth's life-support system. Therefore, valuing the ecosystem services before and after sea reclamation is crucial to marine management and the sustainable development of marine sources. In this study, based on the observed and collected data of subaqueous bedforms, sediments and hydrodynamics from 1985 to 2005, we analyzed coastal evolution and valued ecosystem services at Gudong Coast in the Yellow River Delta after the building of Gudong seawall in 1985, using ecological and dynamical geomorphology method. The results showed that the north coasts of Gudong had suffered from serious erosion because of dominated marine condition while the south coasts of Gudong controlled by water and sediments discharged from the Yellow River estuary. Gudong coasts were thus divided into four areas: back area of the levee, root area of the levee, infront area of the levee and outer sea area of the levee. It is demonstrated that the value loss of coastal ecosystem services at Gudong coasts during 1985-2005 was huge and would be larger in the future according to the loss appraisal of ecosystem services. Whereas, the groins could improve sedimentary environment at Gudong coasts and then reduce the loss of ecosystem services effectively.