Abstract: UAV aerial photography technology is widely used in engineering surveying and mapping because of its advantages of flexibility,high efficiency and extensive application.In this paper,the technical difficulties of UAV in marine surveying were discussed,and a practical application case of UAV in marine surveying for aquaculture in Bachimen sea area of Dongshan County,Fujian Province was presented.Based on the actual topography of the coastal zone,the use of video control points,the implementation of sub-block aerial survey,three-dimensional data collection and other technical means,we offered the accurate and efficient solution to Bachimen sea area marine aquaculture survey problems.At the same time,the difference of area between UAV and field measurement was less than 0.15%,and the average difference was 0.06%.The results showed that the UAV aerial photography technology could be applied to the inshore mariculture survey.