Based on expert interviews, relevant literature research and practical experience, combined with the characteristics of the whole-process engineering consulting model, corresponding hypotheses were put forward and a model of the mechanism of constraints on the application of the whole-process engineering consulting model was constructed. Based on the PLS-SEM method, the mechanism model was verified. The verification results show that policy guarantee, market cultivation, service ability and social awareness all directly affect the application of the whole-process engineering consulting model, and the direct effects are policy guarantee> service ability> social awareness >and market cultivation. Market cultivation and service capabilities play a partly intermediary role between policy guarantee and the application of the whole-process engineering consulting model.