Abstract: The farmer professional cooperatives is an important means to change the vulnerable position and improve the bargaining power of farmers in the process of agricultural trade. This article constructs a tri-stages bargaining game model between the farmer cooperatives and channel partners, which contains the range of price of agricultural products, the pressure of psychological, and other factors in the bargaining game analysis. It uses reverse deduction and comparative analysis to get the game equilibrium. The results obtain the following three points: comparing the individual farmers, farmer professional cooperatives have stronger bargaining power; the different psychological pressure can affect the state of negotiations; under the certain conditions, the negotiating parties can ascertain each other's bottom price line.