Trilemna effect is an importarlt criteria for the self-convergence deflection system. The influence of the higher order Trilemma effect should be taken into account for the correction of the higher-order deflection aberrations. In this paper

when up to the seventh-order Trilemma contants are adjusted

the expression of the innuence of 2n-pole multipole field on n-th order Trilemma constant has been deduced and this innuence has been calculated.