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This research demonstrates five approaches of extracting degree of ignorance(DOI)coefficients of index systems based on the DOI factors of investment decision making systems.Based on Dempster-Shafer(D-S)evidence reasoning,A comprehensive decision-making model of transportation project investment(CDM-TPI)is constructed.Lastly,the case comparison studies are carried out to validate the effectiveness and practicability of the model when applying in the investment decision making systems with the DOI factors.