In the research process of air defense missile weapon system,it is an urgent problem to improve the fidelity of complex electromagnetic environment construction,which should be similar to the scenario. According to analyzing the electromagnetic interference environment faced by air defense operations,the quantitative indicators of the fidelity of electromagnetic interference environment were given arately from the equivalent simulation of interference scene, interference tactic, interference technology and interference intensity, which formed the construction method of complex electromagnetic interference environment of air defense missile weapon system.The method has referential value for test verification of air defense missile weapon system.