Abstract: In order to reduce computational resource overhead and decision processing latency, 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. Firstly, an analytic hierarchy process model was established for air defense radar site selection, and the relative importance of each factor was qualitatively analyzed by constructing a judgment matrix and consistency testing. Then, decision thresholds was set to screen the main site selection influencing factors and the weights of site selection factors was updated. Finally, the weights of each factor and their impact on site selection were comprehensively evaluated in order to make the final site selection decision. The simulation results have verified the effectiveness of improving the AHP through decision thresholds. Compared with the results of the unimproved AHP, the method can effectively reduce the computational complexity of decision making (about 0.38~0.75 for unimproved AHP), and the consistency rate of site selection can exceed 92% under different threshold settings. In addition, this method provides certain guidance and reference value for improving the analytic hierarchy process model and solving location problems.