The evaluation system is investigated for the disturbing effect of optical countermeasure device to photoelectrical guided weapon in this paper. The general optical countermeasure simulation model is established by using photoelectrical countermeasure simulation test to conduct the estimation of countermeasure effect. The target-missing quantity of guided weapon and guided precision is designated as evaluating index. Whether the disturbing is valid or not is based on Whether the target-missing quantity is more than 3 times of normal guided precision without disturbance or not.