The frequent malfunctions of swing winch,too small torque,and the bitten rope problem occurs from time to time,which cause the decline of ship productivity and the increase of the maintenance cost of wire rope.According to the relevant specifications and design drawings of the ship,we analyze in detail the bitten rope problem of the swing wire,and find out the causes of the problem,formulate the technical schemes 1 and 2 for the reconstruction and installation of the winch combining with the main technical parameters and drawings of the new swing winch,and demonstrate in detail the necessity of deflecting the center of the winch drum relative to the center of the bridge frame in the two schemes from the angle of avoiding the bitten rope problem.The results show that after the new winch is installed on site by technical scheme 2,the arrangement of winch wire rope during ship construction is regular without bitten rope problem,which improves the performance of the ship.