Consumer' s perception of the quality of agricultural products in the market will influence the strategies of the upstream enter- prises. In this paper, the market is assumed to be under two opposite conditions: one is that agricultural product quality is identifiable and the other unidentifiable. The agricultural products supply chain is divided into three structures depending on the dominant firms and Stackelberg Game Model is used to discuss quality investment and product price. The research reveals that when quality is unidentifiable, the...