為探究改制後，鄉鎮市改制為區級機關對於地方事務造成的影響，本研究以臺中市為對象，以深度訪談的方式，希望從地方自治的精神來瞭解12位轉任區長的原鄉鎮市長，在同時具有民選及官派經驗的情況下，對於鄉鎮市長民選與官派的態度。此外，再以善治的參與(participatory)、共識取向(consensus oriented)、可課責性(accountable)、透明性(transparent)、有回應(responsive)、效能與效率(effective and efficient)、公平與不排他(equitable and inclusive)與遵守法規(follows the rule of law)八個特性為基礎，探究合併後是否達成善治的成效；最後則是探討當鄉鎮市長由民選改為官派之後，地方政治生態可能出現的變遷。
Taichung, Tainan and Kaohsiung cities and counties have merged and promoted to municipalities December 25, 2010, and Taipei County was upgraded from quasi-municipality to municipality. One of the vital change in local government organization is the original county-level townships of democratic election have transformed into district organization of assignment accordingly. Under the specification of the Local Government Act, parts of the former township mayors have transferred to the supervisors. Due to the supervisors having the experiences as the elected township mayors, they become the best practice subjects to be studied as the democratically elected or officially assigned township mayors.
To investigate the impacts of local affairs after the transformation of township into district organization, Taichung City is adopted as the subject in this study. With depth interviews, we hope to learn the 12 former township mayors from the viewpoints of the spirits of local self-governments, as well as the attitudes of mayors about either being elected or assigned for those that have both election and assignment experiences. In addition, based on the following 8 characters of good governance that are participatory, consensus oriented, accountable, transparent, responsive, effective and efficient, equitable and inclusive, and following the rule of law, we explored the effects in good governance after the mergence. Finally, we hopefully investigated the possible changes of local political ecology after the official assignments of those former elected township mayors.
In this study, we conclude that most supervisors of the former township mayors prefer to maintain the democratic elections of township mayors from the viewpoints of the democratic principles, local self-governance and practical local developments. As for the governance effectiveness of the transformed Taichung City Government, most of respondents consider the 8 characters of good governance with negative views. All respondents even have the ideas that the efforts of city government are still insufficient in the part of accountability. However, the most approved part is compliance, but there are only 4 respondents behold the positive attitudes. That indicates that the city government still has a great deal of efforts to mend in the governance developments. Finally, as far as the changes of local political ecology, the changes of legislator election system as well as the substantial reductions of elective officials being competed after the transformation have made the local factions that have dominated the local political ecology in the past declined gradually. Instead, it is replaced by the party politics as well as the respects for administrative neutrality.