Traditional face-to-face meetings, the most frequently used methods for group decision-making, has resulted in poor performance from stress of conforming the majority's view or a minority authority. The purpose of this research is to investigate the effect of GDSS for supporting enterprise conference,and to Complete K company's target of 2009 and KPI of departments by using TeamSpirit system which is interacted with face-to-face meeting. The results show that GDSS for supporting enterprise conference has positive influence on efficiency and performance, and enhance the quality and quantity of members' ideas.