鑑於我國分裂投票研究多數著重於縣市層級的地方首長與民意代表選舉，本文探討台灣首次於同日舉行的2012年總統暨立法委員選舉，援引「政治矛盾」（political ambivalence）做為研究架構，分析選民的一致與分裂投票。作者假設，選民的政治矛盾程度愈高，愈可能進行分裂投票；反之，民眾的政治矛盾態度愈低，愈可能採取一致投票。作者擷取「2009年至2012年『選舉與民主化調查』三年期研究規劃（3/3）：2012年總統與立法委員選舉面訪案」調查資料，運用「勝算對數模型」（Binary Logit）與「多項勝算對數模型」（Multinomial Logit）進行檢證。資料顯示，在總統與區域立法委員選舉，以及總統與不分區立委選舉的分裂投票實證模型中，在控制其他變數的效應之下，選民的政治矛盾態度對於分裂與一致投票，確實具有顯著影響。此外，選民的省籍、制衡觀與政策平衡等因素，也與一致與分裂投票有關。在結論中，本文摘述分析要點，並提出政治矛盾態度的研究意涵。 / In light of many election studies on straight and split ticket voting for the head of local government and councilors in Taiwan, I focus on people's ticket splitting of the 2012 presidential and legislative campaign which is the first election holding on one day. This article introduces political "ambivalence" to explain why people vote split or not. I assume the voters who have more ambivalent about KMT and DPP, more ticket splitting; and the straight ticket voters should be less ambivalence. My dates are based on "Taiwan’s Election and Democratization Study, 2012: Presidential and Legislative Election," and analyzed with Binary Logit and Multinomial Logit. When controlling other variables, party ambivalence intensively affects voters' straight and split ticket voting not only for president and constituency legislators but for president and party block legislators, and nearly all coefficients are statistically significant. By the way, provincial origin, cognitive Madisonianism, and policy balancing on independence issue or social welfare correlate to straight and split ticket voting in models. I conclude the major findings and research limitations at the end.