This paper explores the partisan vote-choice of Taipei electorate in the second mayoral election of 1998. Besides, split-ticket voting is focused and, especially the split-ticket voting among New Party's supporters is thus singed out to be examined vis-a-vis its straight-ticket voting counterpart. First, as shown in our findings KMT's candidate Mr. Ma was advantaged by his party mobilization, DPP's candidate Mr. Chen by candidate evaluation, and NP's candidate Mr. Wang had comparatively higher proportion of issue-voting. Second, the factors of ethnic identity, partisanship, candidate evaluation, and stance on the unification-independence issue were found to have direct significant effects on voter's partisan vote-choices. Third, electorate's straight-ticket or split-ticket voting were found to be determined by a cluster of factors that related with voter's ethnicity, partisanship and candidate evaluation. Finally, the phenomenon of straight-ticket and split-ticket voting among NP's supporters is best explained by their education level and attitudes toward Ma, the KMT's running mate. This paper concludes that the 1998 Taipei mayoral election was heavily aired and stuffed by ethnic conflict, crisis of KMT regime and/or debates on the unification-independence issues. Therefore, those related factors were consequently becoming both the determinants of electorate's partisan vote-choice and of adopting either straight-or splict-ticket voting. In such electoral environment, NP's supporters were facing a dilemma, and to the upmost goal to defeat the least-like DPP's candidate, most of them chose to pit KMT's candidate against the nominee of their own party.