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In the wireless energy transmission system of submunition, each coil is cross-coupled, which affects the transmission efficiency of the system. By establishing a parallel resonant wireless energy transmission system model, the influence of the coupling between bullet coils on the transmission efficiency of the system is analyzed under the condition that the coupling between bullet coils is very small, and the frequency condition of bullet coils is obtained at the maximum transmission efficiency;Finally, the influence of bullet coil frequency offset direction and coil coupling on the transmission efficiency of the system is verified by experiments;The results show that the frequency of bullet coils is higher than the initial resonant frequency when the maximum transmission efficiency is reached. When the distance between the bullet coil and the mother round coil is large, multiple mother round coils should be used to transmit energy to it. And the maximum transmission efficiency of the system can be improved by reducing the coil distance between the bullet and the mother round.