Aiming at the problem that TSHD has large volume and deep draft,and it is often unsuitable for construction in shallow and narrow waters,the construction technology of the harrow suction dredger in the shallow suction and narrow waterway is studied.Through the analysis of factors such as tide,water depth conditions,harrow suction vessel characteristics,construction technology and other factors,it is concluded that the selected ship's on-line position not only needs to meet the depth requirements of the ship's dredging at the time of on-line,but also the ship's surplus water depth ensures requirements at each time period under the construction speed.The construction technology takes the surplus water depth at the bottom of the ship as the key control quantity,extends the on-line position as much as possible so as to ensure the length of the construction section and gradually expand the working face.Meanwhile,the technical bottleneck of the construction of TSHD in shallow and narrow waterway has been broken through.