Integrated supply chain includes both forwards logistics and backwards logistics, both original manufacture and remanufacture. A well designed integrated supply chain model could close the material cycles and make full use of the materials. In this paper, we proposed a new style that the used goods can be collected by the retailers. Some multi level mathematical programming models are presented to research the collection policy of integrated supply chain. In the multi level programming models, we taking into account not only total profits of the whole supply chain, but also profits of every participant, such as profits of manufacture, retailer, and collector and so on. After solving the model mathematically, we analyzed the optimized resolutions of the programming model. Our conclusion is if the remanufacture ratio of the manufacturer is not very high, the used products should be collected by the retailers. The collection ratio and the sales of retailer are all higher than that of the collector. But if the remanufacture ratio of the manufacturer is rather higher, the used products should be collected by the collectors whose work may be more efficiency.