Abstract: Some methods are put forward for improving the convergence rate of the COA (chaos optimization algorithm) based on second carrier wave,which can greatly increase the velocity and efficiency of the first carrier wave to search for the optimal point at comparatively rough precision,and the refined search can be performed during second carrier wave more quickly as well as accurately.In addition,the concept of third carrier wave is put forward and is put into practice,to tackle the multi-variable optimization problems where the searching for the optimal position of the last several variables is frequently worse than the first several ones.Quite a number of computing examples indicate that the method in this paper is quite effective.Finally,this method is successfully applied to the maneuverability optimization computation of a special kind of ship,and the outcome is satisfactory.