LIDAR(Light Detection and Ranging) is a new technology of acquiring three-dimensional (3D) coordinates with high precise and density, which gathers laser measure distance, computer, GPS(Global Positioning System) and INS(Inertial Navigation System) in the integral whole. This paper briefly introduces LIDAR Technology. Then the character and demand of TFACZ (Tidal Flat and Coastal Zone) is analyzed, and the analytic result indicates that LIDAR technology is the most effective means of solving problems of geographical data acquisition in TFACZ. Lastly the paper discusses lots of applications of LIDAR Technology in Topographic Survey of TFACZ.