In the lake dredging,channel regulation,port construction and land reclamation engineering by the cutter suction dredger,problems such as huge pipeline resistance,severe abrasion and high energy consumption,etc.exist in the long-distance slurry transportation,which limit the productivity of dredgers.Based on the engineering practice,we study the technology of dredging pipeline’s air-injected transportation,analyze the influence of the air-injecting technology on the oil consumption and production efficiency of the dredger,and draw the conclusion that by applying the air-injecting technology,we can reduce energy consumption and increase the productivity of dredgers in the long-distance dredging.