The silty cohesive soil has large transfer resistance during the bow blowing construction of medium and large suction hopper dredger, which will cohere together and become spheres to block the dredging pipeline, and then will influence the efficiency of bow blowing construction.On the basis of systematically analyzing the existing domestic and foreign mud pipeline blockage prevention method, we develope a kind of anti-blocking equipment and implementation methods of pipelines of suction hopper dredger and carry out the field test research depending on the dredging and fillinging in Qingdao Port.The results show that compared with the traditional technology, this method is easier to construct, fast and flexible, operability, economical, and safe and reliable;the silty clay dredged material bow blowing operation can be carried out under short-distance, medium-long-distance and long-distance conditions;the efficiency of the silty clay dredged material bow blowing operation has been greatly improved.