In view of the problems of quality such as floating,turning,folding and low construction efficiency in the laying of three-way geotechnical mats in deep water unsheltered area,we carry out on-site investigation and statistics to identify the causes and formulate relevant countermeasures.The test section was completed by matching the length of geotextile and distance of vessel movement,introducing professional geotextile-laying ship and encrypting ballast point.The results show that the grading pass rate can reach 96.7%,the axis deviation pass rate can reach 95.7%,the construction efficiency is increased by 33.3%,and the construction period and economic benefits are remarkable.