In view of the problems such as high computational complexity, large redundancy, weight solidification and insufficient scene adaptation when using the traditional analytic hierarchy process (AHP) model for multi-party decision analysis, an improved analytic hierarchy process analysis model (DSA-AHP) based on dynamic admission mechanism and scenario-based settings is proposed. And the decision-making analysis of preventive curing measures in the Shanghai area is taken as an example for application verification. Results demonstrate that this model, by only conducting corresponding decision analysis on specific demand schemes, achieves the rapid screening of the scheme layer and the scenario-based weight matching of the criterion layer (sub-criterion layer) so as to significantly improve the decision-making efficiency and accuracy with the strong practical value.