Abstract: By considering factors such as plant geographic position, production capacity, inventory restriction, transport capacity and customer satisfaction etc., an order decision and production planning integrated ATP model was developed for assembletoorder multiplant manufacturer. Finally, a series of performance analysis experiment was conducted to reveal the impact of some key factors such as planning horizon, batch interval etc. on overall profit.

Key words: available-to-promise (ATP), multiplant, production planning and scheduling, mixed integer programming(MIP)