In view of the problem that the water depth at the end of the slope type launching chute in the traditional prefabrication yard is not sufficient to meet the launching and transportation of large caissons,the research on the launching technology of the caisson assisted by the large lifting force of the crane vessel is carried out.The method combining theoretical calculation with physical model test is adopted to carry out the relevant relations among the caisson lifting point setting,the large steel structure hanger system,correlation between the buoyancy supporting lifting force and the caisson draft and the fixed tilt height,etc.After detailed analysis,a new hoisting system for caissons transportation on the slope type launching way is put forward,which has been successfully applied to the supporting wharf project on the north bank of Dayaowan in Dalian Port,providing a mature and reliable solution for large draft caissons transportation on the existing slope type launching way prefabrication yard.