Abstract: As the operational mode of three-dimensional air surveillance radar cannot be identified and therefore intelligent interference cannot be applied,an operational mode identification method based on beam-position modeling is proposed in this paper. First,dividing its operational mode based on the characteristics of three-dimensional air surveillance radar's processing clutters; Next,the modeling analysis and recognition confidence level calculation; Last,integrating data from multisensor based on D-S evidence theory,thus the credibility of identification is improved. Simulation results show that the proposed algorithm can identify the operational mode of three-dimensional air surveillance radar effectively.