The design problem of a new type of repairing dock is studied.This kind of dock has not been studied so far in the field of ship repairing,which is different from traditional floating docks. When working,the dock adheres to the aft section in a semisubmerged state.It is principally used to repair the propeller of ships.The feasibility and the practicable design plan of this kind of dock are studied,which can be used in repairing 150000DWT ships. The design problem of a new type of repairing dock is studied.This kind of dock has not been studied so far in the field of ship repairing,which is different from traditional floating docks. When working,the dock adheres to the aft section in a semisubmerged state.It is principally used to repair the propeller of ships.The feasibility and the practicable design plan of this kind of dock are studied,which can be used in repairing 150000DWT ships.