Abstract: This study focuses on Xinghai Beach in Lingshan Bay, Qingdao, utilizing multi-temporal remote sensing imagery and high-precision topographic data to analyze the changes in coastline and beach morphology induced by the construction of Xingguang Island. The results indicate that after the completion of Xingguang Island, the coastline morphology transitions from an accretional state in the southwest to an erosional state towards the northeast, and the geomorphology of the river mouth channel is controlled by the influence of runoff, which has a significant impact on the evolution of the beaches on both sides. The longshore sediment transport is obstructed at the river mouth, and the siltation intensity on the east side is stronger than the west side. From the profile characteristics, the slope of the beach surface in the wave-influence area west of the Baiguoshu River behind Xingguangdao Island is stable, and both the numerical simulation and field measurement results show that the average elevation change of the beach before and after the summer and autumn seasons is less than 0.2 m. Outside the wave-influence area, the coastal section gradually becomes stronger towards the east, and the profile morphology changes from the normal wave profile (upper accretion and lower erosion) to the storm profile (upper erosion and lower accretion).