Abstract: This paper proposes an Analytic Hierarchy Process (AHP) model with improved decision threshold to address the issue of multiple influencing factors and high computational complexity in the selection of air defense radar sites, in order to reduce computational resource overhead and decision processing latency. Firstly, establish an Analytic Hierarchy Process (AHP) model for air defense radar site selection, and qualitatively analyze the relative importance of each factor by constructing a judgment matrix and consistency testing. Then, set decision thresholds to screen the main site selection influencing factors and update the weights of site selection factors. Finally, comprehensively evaluate the weights of each factor and their impact on site selection, in order to make the final site selection decision. The simulation results have verified the effectiveness of improving the AHP through decision thresholds, and compared with the results of the unimproved AHP, there is a higher degree of agreement in the decision-making of important site selection factors. In addition, this method provides certain guidance and reference value for improving the Analytic Hierarchy Process model and solving location problems.