As usually the evaluating EOCM for seeker processes through experiment in Laboratory or test in out-ground. So that a lot of ECM and simulation equipments have equipped necessarily. But in further war status, the ECM and EOCM techniques rapidly develop with variability environment, which enhances a great cost of experiment research. Now, the numerical techniques are making a useful design skill for the missile homing. A main theme of this paper is to study numerical simulation technology of EOCM for the dual-seeker that consists of a radar/infrared integrated and a evaluating method about the effectiveness for EOCM is discussed as well.