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The orthogonality of FBMC/OQAM system is only satisfied in the real number field, and there is inherent imaginary part interference problem, which makes accurate channel estimation very difficult. In order to deal with the influence of inherent imaginary part interference on system channel estimation and improve system performance, the elimination scheme of imaginary part interference is studied. Depended on the existing scheme of FBMC/OQAM system based on the interference cancellation principle, the neighborhood zeroing scheme, the auxiliary pilot scheme and the coding scheme of the existing scheme are integrated and balanced, then a partially zeroing coding auxiliary pilot scheme is proposed. Theoretical analysis shows that compared with the original scheme, the proposed scheme improves the spectrum utilization , reduces the peak-to-average power ratio and computational complexity. Further simulation results show that the proposed scheme has lower bit error rate and minimum mean square error in multipath channel than the existing schemes under the same interference computation domain, which has certain application significance.