Based on the difference of the combat ability of equipments and the influence of life cycle phase on the combat ability of equipments, the system dynamics' model on macroscopical control analysis of the life cycle costs of equipments is set up, which describes the relations between all the phases of the weapons' life cycle objectively and soundly. By simulation experiment of macroscopical control analysis of the life cycle costs of equipments, some experimental conclusions have valuable reference to the construction and development of equipments.