In order to analyze the vertical collusion of bidding in government investment pro-j ects,to prevent and control the vertical collusion of bidding behaviors,combined with the questionnaire investigation among bidding parties,colleges and universities and other insti-tutions at the bidding stage of the proj ect,based on exploratory factor analysis ,the causes of the vertical collusion of bidding in government investment proj ects have been summa-rized.By verifying the reliability of the data,and dividing the 15 causes into four levels through dimensionality reduction,and several key causes of v...