1989年起，政府開始推動都市更新，以台北市而言大多數都市更新以建設公司為主，往往與住戶產生各式各樣的爭議，然而以自主都市更新案例數量很少，相對能夠順利進行的自主更新案例更少，以水源四五期在這些案例中能夠順利進行是非常特別。因此本研究想要瞭解水源四五期在自主都市更新特別關鍵因素。 本研究對自主性都市更新瞭解目的：1.更新會在社區如何推動都市更新的過程；2.公部門法令和制度是否影響住戶意願；3.專業團隊在都市更新事業如何協助更新會；4.住戶是由何種原因需要由銀行提供資金。 本研究針對以下四個面向對水源路四五期進行訪談瞭解：1.更新會推動更新的過程與住戶彼此信任，讓更新能順利進行；2.公部門了解住戶的需求給予適當法令和制度的協助；3.專業團隊進入更新讓住戶了解更新事業，並與更新會保持密切互動；4.住戶向銀行團隊融資得到全額貸款，降低財務壓力。 藉由個案研究水源路四五期發展過程，分析出在都市更新中，主要操作的關鍵角色：1.更新會；2.專業團隊；3.公部門。提出都市更新三種課題：1.整合；2.容積；3.資金。經由關鍵角色在各課題中產生的問題、如何的處理及扮演的角色內容，來分析個案之更新事業的特殊要件。 本研究中探討出，水源路四五期能順利進行更新的特殊要件為：1.更新會與住戶關係密切，彼此熟悉度高，不易受外界影響，因此所有權人100%同意更新；2.當有發生爭議時，透過共識方法、和平對談進而減少爭議；3.更新會積極與公部門對談，公部門提供適當法令和協助；4. 所有權人100%同意向銀行融資；5.銀行提供全額資金。 Since 1989, the government began to implement urban renewal program which mainly lead by construction companies in Taipei city. It easily cause different distribution problem between the construction companies and resident during program execution. However, the case of community driven urban renewal is fewer, the successfully is less. Then Shuiyuan rd. stage four and five that it could be successful is an unusual case. Therefore, the research want to understand the special key of Shuiyuan Rd. stage four and five. The objectives of this research as follows: (1) Understand the process of community participation in urban renewal. (2) Understand the influences of bulk reward for urban renewal which public sector provide on residents'' wishes. (3) Understand the process of professional team assisting urban renewal group in conducting urban renewal business. (4) Understand the reason of residents borrowing money from banks, residents'' demand and the conditions that Banks propose. There are four respects about the Shuiyuan rd. stage four and five for interviews of this research: (1) Urban renewal group and residents trust each other during the renewal process. (2) Public sector understand the demand of residents, provide appropriate acts and administrative resources. (3) The professional team participate urban renewal that residents understand urban renewal business and keep in interactive with urban renewal group. (4) Residents loaning the money from banks to reduce financial pressure. The research generalizes that urban renewal group, professional team and public sector are the three important roles in urban renewal. Also, integration, bulk, funds are the three issues in urban renewal. In accordance with these important roles and issues, the research tries to find the key factors of urban renewal business. The results reveal the key factors of Shuiyuan rd. stage four and five resettled tenements can successfully implement urban renewal as follows: (1) The close relationship between residents and the owner''s acceptance of urban renewal. (2) To have common understanding with owners. (3) To strive for bulk reward to public sector. (4) The owner''s acceptance of financing. (5) The Funds that banks are willing to provide.