In this paper CP violating nucleon-nucleon interactions are studied in several models. The experimental upper bounds on atomic electric dipole moment (EDM) are used to constrain CP violating parameters. The constraints from this consideration were compared with that obtained from the upper bound on the neutron EDM. It was found that although the constraints from the former consideration are not yet as sensitive as the latter, in some models the constraints from both considerations are within an order of magnitude. 45 refs., 1 fig.