Currently companies are increasingly sensitive and responsive to the carbon emissions associated with their operations. Operational adjustments, such as modifications in order quantities have proven to be an effective way to decrease carbon emissions in the supply chain. Most of research on the inventory model under the cap-and-trade system consider single product case. In this paper, we introduce a multi-product inventory model under the cap-and-trade system incorporating the carbon emissions caused by logistics and warehousing activities. Also we present a heuristic algorithm and derive the common order interval and the number of intervals for each product. We show by numerical example that the inventory model incorporating cap & trade mechanism can reduce total cost and carbon emissions compared to the classical inventory model.