Abstract: With the advancement of the Western Land-Sea New Corridor strategy, Shajing Island, the estuary of the Pinglu Canal, serves as a crucial node. The evaluation of the engineering geological suitability of its coastal zone is of great significance for regional development and ecological protection. This study, based on multi-source data (geological exploration, remote sensing images, hydrological data, etc.), combines the Analytic Hierarchy Process (AHP) and GIS spatial analysis technology to construct a suitability evaluation system covering six major criterion layers, including topography and geomorphology, hydrology, engineering geology, hydrogeology, adverse geological processes and geological disasters, and ecological environment, with 17 indicators. The results show that the coastal zone of Shajing Island can be divided into moderately suitable areas, less suitable areas, and unsuitable areas. The unsuitable areas are mainly affected by soft soil distribution, sections severely impacted by floods, waves, tides, and storm surges, water and soil corrosivity, coastal erosion, and ecological environment sensitivity. The study proposes a "zonal control + engineering optimization" strategy, providing a scientific basis for coastal zone engineering construction and ecological protection.