Possible Suppression of Neutron EDM

Employing generalized Schiff's transformation on electric dipole moments (EDM) in quantum field theory, we show that the chromoelectric EDM lagrangian density is transformed into the electric EDM term with a new coefficient. Under the new constraint on the EDM operators, the neutron EDM can be described by a unique combination of electric EDM $d_f$ and chromoelectric EDM ${\tilde d}_f $ of quarks. If the special relation of $\displaystyle{d_f={e_f\over{2g_s}}{\tilde d}_f}$ holds, then the neutron EDM is suppressed significantly.