本研究分析在2005年台北縣長選舉中，民眾是否以回顧性評價或是展望性評估來決定其投票對象。運用2006年「台灣選舉與民主化調查」的研究資料，分析民眾對於過去的家庭經濟情況、社會整體經濟狀況評價及施政表現；以及民眾對於未來家庭經濟、總體經濟狀況評估及主要政黨候選人展望性預期，是否影響其投票行為。 本研究發現：控制民眾的人口學背景以及其他政治態度之後，民眾認為過去整體經濟情況變差者，愈不傾向投給民進黨候選人。認為民進黨候選人愈具備執政能力者則愈傾向投給他。除此之外，民眾的政黨認同也具有重要的影響力。 從本研究的結果可以得知，民眾會運用理性的標準，判斷過過去總體經濟表現與未來哪位候選人較具執政能力而決定其投票對象。顯示執政者應該以總體經濟表現以及優秀的人才，才可以吸引選民持續的支持。 / In this Study, we employ individual-level survey data collected by ‘Taiwan’s Election and Democratization Study” in the 2005 Taipei Magistrate election to examine whether voters apply retrospective voting or prospective voting. We include variables such as personal well-being and national economics performance in the past ,candidate evaluation and expectations on future economic performance to see how these variables might affect their voting behavior. We demonstrate that, after controlling demographic variables and other political attitudes, when voters consider national economy is worse off, he/she voted against the incumbent party. However, voters give greater support to candidates of the incumbent party if he/she believes this candidate is competent to govern Taipei county. Additionally, party identification still exerts a powerful influence upon the individual vote decision. In the study, it is found that people decide their voting behavior is employ their rational calculations to examine sociotropic economic performance and candidate quality. Therefore, citizens are not fools, and the incumbent party has to realize the importance of governance and nominate qualified candidates to govern.