Abstract: According to facts that the traditional single frequency continuous wave electromagnetic radiation susceptibility test methods cannot satisfy the requirements of the multi-frequency complex electromagnetic environment adaptability evaluation for the electronic equipment, following the principle of limited target, the blocking interference effects prediction problems for the electronic equipment under the condition of the dual-frequency narrow spectrum in-band electromagnetic radiation is researched. Based on the single frequency and the amplitude modulation continuous wave electromagnetic radiation susceptibility test data, considering the theoretical analysis of the electromagnetic energy coupling and the interference damage acting mechanism for the electronic equipment, the dual-frequency in-band electromagnetic radiation blocking interference effects prediction models and prediction methods for two kinds of electronic equipment are established separately. The one electronic equipment is sensitive to the effective value of the in-terference signal. The other one is sensitive to the peak value. The decision method of choosing prediction model for the different electronic equipment is put forward. The typical ultra-short wave communication stations are selected as radio equipment under test. The test results verify the validity of the prediction model and the prediction method. The above researches indicate that the model and method presented in this paper can be effectively used to predict and evaluate the blocking interference effects for the radio equipment under the condition of the in-band dual-frequency electromagnetic radiation.