Model and use: project investment decision-makingbased on comprehensive attribute

Now in the investment decision-making of many projects, the evaluation index is used separately, in the return of investment, the net present value, and in the internal rate of return ignoring the affiliation of the evaluation index. Aiming at these problems, this text put forward the investment decision-making model which is based on the comprehensive weight, this model considers the relation of all index comprehensively, and calculates the comprehensive weight of all index, then gets the comprehensive attribute of all schemes. The article, by using this method makes up the defect of all indexes and provides the credible gist for the best scheme chosen.