A method and a system for making a production plan are proposed, for allowing a request from a client to be analyzed in real time, and the production plan to be constructed in response to manufactured or semi-manufactured products at a production line, so as to implement production according to the production plan and allow a production condition to be effectively controlled and managed. Moreover, the method and system for making a production plan allow a production cycle and human resources to be effectively controlled and adjusted respectively, so that sale, purchase and manufacture departments can realize the latest production and export conditions according to the production plan. In addition, in the use of the method and system for making a production plan, the manufactured products can be effectively controlled in stock and exportation.