Abstract: Conventional methods for regional bathymetry mainly use shipborne acoustic detection technologies. However, since the hull cannot access the coastal shallow waters and the areas with dense islands and coral reefs, there is no available data of near-coastal areas. These problems can be effectively solved with the emergence and development of airborne lidar bathymetric technology, which has become a fast and efficient method for water-depth and submarine topographic exploration. Based on the airborne laser sounder CZMIL Nova, this paper introduces the characteristics and influencing factors of the land-sea integrated technologic surveying and its preliminary application in the land-sea integrated topographic surveying of islands.