Abstract: The risk game theory in the weapon equipment acquisition process is analyzed on the basis of weapon equipment acquisition requirements and the fundamental principles of principal-agent theory.Then,the equipment acquisition model based on risk sharing is established based on Mirrless-Holmstrom model,the effectiveness of the model is studied,and the model is illustrated with Edgeworth box pane diagram.The influential factors and attentions issue of the risk in the weapon equipment acquisition process are analyzed finally.The result shows that under the unsymmetrical information conditions,the effective risk-taking method is that both sides take part of the risks,which can lead to the risk-incentive behavior of the developers,and how much risk should be taken by either side is determined by total risks,risk preference of the decision-maker and risk costs.