Abstract: On the basis of questionnaire survey, the risk factors evaluation index system of PPP model in central and western counties of China is constructed. After calculating the weight of risk indicators, nine key risk factors restricting PPP projects in central and western counties were selected from 19 risks, and divided into four key risk groups through relevant tests and factor analysis, namely political risk, economic risk, market environment risk and cooperation risk. The results show that political risk is the most important risk group that restricts the development of PPP, and the lack of project income is the single risk factor with the highest score.

Key words: PPP mode, Midwest counties, questionnaire survey, risk evaluation, development outlet