Abstract: Taiwan question is not only an question left over from China's civil war,but an international legacy of the cold war.Its nature implicates complex duality.Overlooking such complex duality of Taiwan question will inevitably result in a certain deviation in the policy development involved in Taiwan question,and is not conducive to win the initiative against"Taiwan Independence".The concept of"One Country,Two Systems"applied to resolve Taiwan question will see its effectiveness depending on the correct identification of Taiwan question's nature based on which appropriate countermeasures can be developed. Therefore,the said countermeasures should be developed based on the correct valuation of various kinds of elements determining the nature of Taiwan question.