Abstract: Cross-eye jamming is an effective measure for countering monopulse radar. The wave-front phase distortion characteristics of cross-eye jamming are analyzed to have an in-depth study. Based on the coherent stack principle of wave, the phase distortion model of cross-eye jamming is obtained. Then, on the basis of the model, the indication angle error brought by the interference signal is calculated. By comparing the wave-front phase distortion model with the traditional geometrical analysis model, the amplitude ratio of the received signal of the jammer unit is compared as the research emphasis, and the wave-front phase distortion model is corrected. The verification results show that the analysis of wave-front phase distortion is consistent with the traditional geometrical analysis, which verifies the accuracy of wave-front phase distortion model, and establishes foundation for further research about the optimization of antenna parameters.