Electric insulation has always been the key and difficult part of maintenance and overhaul work when ships are in harsh environments of high temperature,high timidity,and high salinity.In order to ensure the normal operation of electric equipment and avoid personal safety accidents,it is important to master the right trouble-shooting method,find out the reason precisely,and handle the electric insulation fault scientifically.Following the actual working situation and existing electric facility,this paper analyzed 3 aspects including equipment,environ-ment and personal management based on typical fault cases,and summarized the management and improvement methods for electric insulation faults of ships.