针对制造商与政府对共同关注的废旧产品回收问题,本文研究了他们进行合作的一种模式。假设政府规定在产品出售给消费者之前必须缴纳一定的保证金,当消费者返还废旧产品时将退还所有的保证金,在此假设下,文章建立了连续随机模型,讨论了随着保证金的变化,销售、回收规模和制造商、回收商的利润的随之变化的规律。并且讨论了当制造商、零售商的利润达到最大时,回收的最佳位置。 In the light of the problem of recycling of waste products that manufacturers and governments pay attention to, this paper studies a model of their cooperation. Suppose that the government stipulates that certain margin must be paid before the product is sold to the consumer. When the consumer returns the used product, all the margin will be refunded. Under this assumption, the article establishes a continuous stochastic model to discuss how the sales will change as the margin changes , The size of the recovery and the law of the profitability of the manufacturer, recyclers. It also discusses the best location for recycling when the profits of manufacturers and retailers are maximized.