Aiming at the problems existing in the large package spraying equipment of ships and marine structures and the characteristics of volatile organic compound (VOC) pollution emission, the design of the equipment for large package spraying process and low-temperature paint transportation technology are improved, the emission reduction measures of VOC source are discussed, the design requirements of large package material supply and the VOC emission path of ship coating and spraying process are analyzed, and the estimation method of large package volume and VOC emission is proposed. Compared with the traditional small barrel paint spraying process, the paint consumption and VOC emission can be reduced by the application of large package paint spraying process.