Abstract
IC (Integrated circuit，IC) design house mean fabless company, and commissioned foundry to manufacture wafer by order. Because IC goods have long production cycle, in order to avoid shortages by lost opportunities, usually prepare more inventories to meet customer forecast demand. So it will take a lone time to deplete inventory when customer actual demand drops. But case company have a problem that some product still high levels inventory, even it takes a long time to deplete inventory. It will make slow moving stock and affect the company's profits. This research proposed an idea that strategies of postpone for wafer purchasing order, and it will be more closer to the market whether give order decision by postpone strategies, and need to foundries delivery adjustment, then will be reduce company high stock level problem after give foundries orders. Base on case company history data validation, and preliminary simulation analysis, through rolling demand forecast table, compared to the normal order strategy, inventory levels can be maintained low; and find stock & demand index interval, provide degree of out of stock for wafer purchaser, and it make more clear to decide order strategy.