PPP mode has been widely concerned in the field of infrastructure construction in China, but there is no perfect system for its risk management, so the risk analysis of infrastructure construction project under PPP mode is particularly important. Based on the analysis of the research and application of PPP model infrastructure projects at home and abroad, this paper obtains 19 risk factors, collects risk factor evaluation through questionnaire survey, combs the risk factors with factor analysis on the basis of a large number of data, finally analyzes and summarizes the four risk factors, and makes clear the PPP mode In order to provide reference for the risk management of PPP project of infrastructure construction, this paper puts forward reasonable suggestions according to the actual situation.