The landing navigation system is an important guarantee of flight security for planes. The worsening airport elec⁃tromagnetic environment has strong impact on the security of planes landing navigation. Taking the instrument landing system as an example,the basic theory of landing navigation system is analyzed,and the mathematic model of planes′received signal during the landing navigation process is provided. Based on this model,an evaluation method of airport electromagnetic environment is proposed. The validity of this method was verified by using computer simulation.%着陆导航系统是飞机安全飞行的一个重要保障，机场电磁环境的恶化严重影响到飞机着陆引导安全。以仪表着陆系统为例，分析着陆引导的基本原理，给出了着陆引导过程中飞机接收信号的数学模型，并基于此模型提出了一种机场电磁环境的评估方法，最后利用计算机仿真验证了该方法的有效性。
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