Water-related optics focuses on the interaction mechanism between light and water and the cross-medium propagation mechanism of light.It can solve various problems associated with optical data acquisition,information transmission,and processing,thereby exploring the science of application.Moreover,it is an important discipline that supports underwater security in the vicinagearth security system.In recent years,with the advancements in optical technology and artificial intelligence,the application of water-related optics has become increasingly noteworthy.Many new theories and technologies associated with water-related optics have emerged.Water-related optics also offer new opportunities and challenges that are of great significance for the defense,protection,production,safety,and rescue of China's territorial waters.In this paper,the data acquisition,information transmission,and processing of optical technology in the field of water-related optics,including sensing,measurement,imaging,detection,optical communication,and intelligent processing,are systematically introduced.Moreover,water-related optics theory,technology,and current challenges are underscored.Future directions of water-related optics are prospected according to the current status of science and technology.