Abstract: The construction of ecological networks is a key approach to connecting terrestrial and marine habitats in coastal zones, thereby safeguarding biodiversity and ecological security. This study takes the Bohai rim economic zone as the research area, integrating ecological redlines and morphological spatial pattern analysis to identify ecological sources based on assessments of habitat quality, landscape connectivity, and ecological sensitivity. A composite resistance surface was constructed, and ecological corridors were extracted using circuit theory, followed by the proposal of targeted optimization strategies. The results indicate that: (1) ecological sources are primarily concentrated in the Taihang Mountains, Yanshan Mountains, Liaodong Hills, and the Shuangtaizi River Estuary, covering a total area of 91256.12 km²; (2) ecological corridors are mainly distributed across the Liaoxi Corridor, the Taihang Mountains–North China Plain transition zone, and the lower reaches of the Yellow River. Coastal corridors are concentrated at the estuaries of the Liao Rivers, Yellow Rivers and Yalu Rivers, displaying a banded distribution along the shoreline. Marine corridors are relatively sparse, and certain areas have become fragmented due to human activities. These findings provide a scientific basis for the construction of coastal ecological networks and the integrated management of terrestrial and marine ecosystems.