To master the anti-electromagnetic interference performance of radar equipment, it is necessary to carry out comprehensive electromagnetic environment effect test and evaluation to provide technical support for radar application and electromagnetic protection reinforcement. Based on the mechanism of pseudo-signal interference effect of second-order intermodulation electromagnetic radiation, the concept of effect index is introduced to characterize the multivariable problem of complex electromagnetic environment adaptability with a single variable. The quantitative characterization of pseudo-signal interference effect of radar equipment in complex electromagnetic environment is realized, and the evaluation model of pseudo-signal interference effect of second-order intermodulation is established. Taking a certain type of sweep frequency continuous wave ranging radar as the research object, aiming at the second-order intermodulation pseudo-signal interference phenomenon in the test radar, the method of determining the model parameters is given, and the prediction and evaluation method of the second-order intermodulation pseudo-signal interference effect of radar equipment is proposed. Experimental verification shows that whether it is to change the pseudo-signal sensitivity level, or to change the dual-frequency electromagnetic radiation combination in the range of large radiation frequency offset and large intermodulation difference, the universal second-order intermodulation pseudo-signal interference effect model can be used to evaluate the second-order intermodulation pseudo-signal interference effect of the tested radar. The evaluation error is within 2.5 dB, and the second-order intermodulation pseudo-signal interference of radar equipment can be objectively evaluated according to the effect prediction method.