In the construction using mega TSHD(trailing suction hopper dredger)in cohesive soil,the TSHD is prone to clogging of the drag head and solidification of the muddy soil in the hopper.In view of this phenomenon,we study the reconstruction of construction equipment and the optimization of construction technology.By introducing the mega TSHD ‘Junyang 1’ with advanced equipment such as submerged dredge pump,strengthening high-pressure jet and reforming the drag head,the influence of drag head blockage can be reduced.The construction technology of "mud sand cushion hoper+ cohesive soil loading" is adopted.The mud and a small amount of sand are used as the lubricant between dredging clay and mud hopper to reduce the retention of cohesive soil in the mud hopper of the ship.Thus the time of throwing mud can be shortened and the construction efficiency of the ship can be improved.