Based on evolutionary game theory, model of knowledge sharing behavior between adjacent nodes on the supply chain of edible agricultural products is constructed. Dynamic evolution of knowledge sharing and rational analysis of ESS and its influence factors are given .It indicates that stabilization of knowledge sharing can be held just on the condition that both the nodes will get additional payoff. Meanwhile the gap of owning knowledge between the nodes, complexity of getting knowledge and credibility in the process of sharing all can be the crucial influence factors.