Abstract: As strict implementation conditions of cross-eye jamming can be effectively improved, multi-loop cross-eye jamming has become a stirring research topic. In this paper, the characteristics of wave-front phase distortion in multi-loop cross-eye jamming system are investigated by using two indexes, the degree of center distortion(DCD) and the effective distortion region(EDR). Firstly, the synthetic field model of multi-element jamming signal is derived, and the constraint model is established by taking DCD and EDR as objective functions. Secondly, parameters such as amplitude ratio, phase difference and the number of loops are optimized by MOEA/D algorithm. Finally, the jamming effect of radar tracking angle is verified by simulation. The results show that compared with the single loop jamming system, multi-loop cross-eye jamming system can effectively improve DCD and EDR, while jamming performance decreases with the increase of the number of loops, and the jamming system is more likely to act as a radar indicator.