Based on the production organization processes of steel-iron factories，this paper proposes a hybrid MTO-MTS order planning management method，and establishes integer programming models for the order planning problems based on MTO management idea and MTO-MTS management idea respectively． The models take into account earliness/tardiness penalty，inventory cost，production cost，inventory matching cost and order cancellation penalty，and consider inventory matching and production planning simultaneously． In order to solve the models，a PSO algorithm with heuristic repaired strategy for infeasible solutions is designed． In the experiments，parameters are analyzed and three sets of data with different order quantities are tested． Numerical results show that the MTO-MTS management mode can avoid the risk of demand forecasting inaccuracy， coordinate the contradiction of fast delivery and low inventory，and adapt to the development trend of the diversification and individualization of market demand．