This paper mainly explores the decision-making of enterprises on information sharing (IS) in forest product supply chain (FPSC). Firstly, several influencing factors of the IS between FPSC enterprises were identified according to the relevant literature, namely, the IS degree, information absorption capacity, the IS cost, incentive coefficient, penalty coefficient, risk coefficient and synergy coefficient. Based on these factors, the author constructed an evolutionary game model for the decision-making of the IS. Then, the dynamic evolution of the IS between FPSC enterprises was simulated on the Matlab, followed by the discussion on the impact of each factor on the IS decisions of each side. The results show that the IS between FPSC enterprises is promoted by the IS degree, information absorption capacity, incentive coefficient, penalty coefficient and synergy coefficient, but suppressed by the IS cost and risk coefficient. Finally, four countermeasures were suggested to enhance the IS between FPSC enterprises, including raising the IS awareness, enhancing information absorption capacity, creating an IS mechanism, and strengthening IS coordination. The research findings provide a reference for improving the IS between FPSC enterprises and enhancing the performance of the FPSC.