决　 策　 树　 模　 型决策树(Decision Tree)是在已知各种情况发生概率的基础上，通过构成决策树来求取净现值的期望值大于等于零的概率，评价项目风险，判断其可行性的决策分析方法，是直观运用概率分析的一种图解法。(The decision tree (Decision Tree) is the basis of probability in the known situations, through the form of decision tree to calculate the net present value of the expected value is greater than or equal to zero probability, project risk assessment, judge the feasibility of the decision analysis method, is the intuitive application of a graphical method of probability analysis.)