Although many research works have been conducted on the bullwhip effect but lack of studies is felt in some area. In this paper, wecontinue our research for studyingof the bullwhip effect in a two-product supply chain. Approximately focus of most of the previous papers is around single product supply chains and researchers have changed common assumptions (like forecasting system, demand model, cost sensitive conditions and so on) and quantified and analyzed bullwhip effect based on new assumptions or investigated the influence of a property (such as information sharing) in the single product supply chains.