In this study, Landsat^TM remote-sensing images (1995 and 2000) and high-resolution remote-sensing images (2005, 2010, and 2016) were collected from waters off Changxing Island in Dalian to analyze the dynamic spatial distribution and landscape pattern change during sea reclamation in that area over the past 20 years. An object-oriented remote-sensing image classification and extraction method was developed to assess the stock resources resulting from sea reclamation. We obtained the following results:(1) The largest dynamic change period of sea reclamation was between 2010-2016, and changes were concentrated in the southeast of Changxing. (2) Small patches of various reclamation types were amalgamated, and large patches expanded. The diversity and complexity of landscape in this area showed an increase, but the dominance showed a decrease. (3) The use efficiency of sea reclamation was relatively low; the filled-but-unbuilt area was the largest of the stock resources, followed by those of the encircled-but-unfilled area and the inefficient industrial town. The total area of stock resources resulting from sea reclamation was 22008.5 hm².