The static game theory is introduced to establish risk-sharing and unilateral risk analysis model based on multi-party win-win rural infrastructure PPP project,thus the initial risk sharing plan for rural infrastructure PPP projects is determined. Based on dynamic game theory,a decision-making model for rural infrastructure PPP projects’ optimal risk sharing ratio is established to find the optimal Nash equilibrium solution of the model and determine the optimal risk sharing ratio. The research shows that in the static game of risk sharing in rural infrastructure PPP projects,the risk appetite and risk control capabilities of the participants determine the initial risk sharing plan; while in the dynamic game of risk sharing of rural infrastructure PPP projects with priority bids by the private party,the size of the negotiation loss coefficient of the public and private parties,the unequal status of the two parties and the degree of information asymmetry directly affect the size of the optimal risk sharing ratio.