This paper first attempts to explore the increasing descensus of national identity of Taiwanese voters based on electoral survey data. Second, factors that determine individual s orientation in diversified national identity are analyzed and the relationship between descensus of national identity and partisanship as well as partisan vote-choices are also causally modeled. As the survey data collected between 1991 and 1993 show, there was an increasing trend of the descensus of national identity.