As a new type of thin-walled prefabricated component applied in ecological environment improvement，the fish nest row can maintain the connection between the water body and the riverbed on the basis of sand protection and locally improve the underwater microbial environment，thereby playing an important role in protecting the Yangtze River. The fish nest row is constructed in the ecological conservation pilot area of the waterway regulation project（Section Ⅲ）in the Wuhan-Anqing section of the main line of the Yangtze River. Combined with the precise control of the construction，on-site observation of the drift of the fish nest row in water flow is carried out. It is compared and estimated based on the numerical model of the Morison equation and the empirical formula of drift distance. Finally，the numerical correction is made to the throwing construction of the fish nest row.