Taiwan society had evolved in the past 15 years, and the citizens had more opportunities to participate in puclic policy decisions.However, the formation of the policy about Mainland China in Taiwan is a very diffcult thing. A lot of different opinions and ideology we can not control. Coping with Mainland China affairs is invitable to Taiwan. No matter economic, politics or society, Taiwan always faces the menace of the Mainland China. Therefore, making a good Mainland China policy is important. Cohering a common comsensus is also essential.And Social Judgment Theory is a descriptive and normative approach to judgment and decision making developed by Kenneth Hammond (1965,1975,1996) on the basis of Lens Model. Social Judgment Theory has been applied to the analysis of multiple cue probability learning, interpersonal conflict, interpersonal learning, and social policy decisions. It has also produced the policy decision aid. Moreover, Social Judgment Theory emphasizes that the¡§Judgment¡¨is generally more effective (reaches a higher achievement level), and more efficient(reaches a given achievement level more quickly) by utilizing of cognitive feedback while making decision. In this study, a serious of simulated decision maing tast about importing Mainland China talent and the Social Jugdement Theory and Cognition Conflict Paradigm have been employed and tested by way of a laboratory quasi-experiment. The research prove : 1.Cognitive feedback is more effective than outcome feedback in regard to the improvement of individual decision quality. 2. Dual cognitive feedback is more effective than outcome feedback in regard to the improvement of individual decision quality. 3.Dual cognitive feedback is more effective than outcome feedback in regard to the elimination of cognitive conflict. Comparing Taiwan with Mainland China MPA students, we can find the students in Taiwan and Mainland China are all concerning about the cues variable of polotics. They all think the politics is the most important variable about the strait affairs.