本論文使用臺中市78位行動者參與8件重要都市發展事件的行動系資料，來分析解嚴後臺中市都市政治權力結構的特質。行動體系分析包括了都市事件公眾、集體行動體、與對立結構等概念。臺中市在都市事件行動體系的結構特質上，並未出現明顯對立的權力衝突結盟體，整個都市事件行動體系的結構包括三個區帶：第一個區帶的集體行動體是由成長意識主導的政府、議會、與派系的利益結明體，這些結盟體的社會網絡密度較高，同時對都市事件結果有高度影響力；第二個區帶的集體行動體是較多元特殊性與暫時性的利益團體，雖然也有相當的成長意識，但集體行動體成員間的社會網絡連結程度低，故對都市事件的結果相對地影響力較低；第三個區帶的集體行動體成員多半是學者專家或非營利團體，成長意識較弱，與前述兩個區帶成員重疊性較低，對都市事件結果影響力最有限。此外，行動者的都市事件整體性的影響力聲望、制度部門、網路居間性與派系對行動者參與臺中市都市事件集體行動體的程度都有顯著性的影響力。 This paper used the data on action system which were constructed by 78 actors and 8 critical urban development events in Taichung city, and analyzed the characteristics of power structure in urban politics after the lift of martial law. The analyses on action system included the concepts of event publics, collective actors, and opposition structure. There were no distinctively two opposite conflict power blocs in the structural. There were no distinctively two opposite conflict power blocs in the structural characteristics of action system in Taichung urban events. There were three structural blocs in the urban action system: The first bloc included the collective actors who were composed of the growth ideology coalitions by civil servants, councilmen, and local factions, and these coalitions with high density of social networks had strong influence on the outcome of urban events. The second bloc included collective actors who were more diversified and specialized temporary coalitions, and these collective actors with some degree of growth ideology but low density of social networks had less influence on the outcome of urban events. The third bloc included collective actors who were composed of professionals and nonprofit actors, and these actors with weak growth ideology and less overlapped with those of the other two blocs had the least influence on the outcome of urban events. In addition, the influence reputation on urban events, institutional sectors, bridge centrality, and local factions all had significant effects on the degree of the participation for urban collective actors.