香港基進政治組織人民力量放棄以激進方式表達訴求，改以「快樂抗爭」作為政治策略以吸引大量群眾參與，並形成可觀的政治力量施予政府政治壓力。人民力量雖然以基進組織自居，何以取「快樂抗爭」作為它的政治策略呢？在此論文會仔細討論「快樂抗爭」如何以喜慶節日之感，讓與者用以直接抗爭為手法，承擔昂貴的政治成本來表達訴求，代之以輕鬆快之手段鼓動更多公眾參與。同一時間，縱使情緒搧動可以直接鼓動民眾與政治運動，然而情緒也有不智的一面。為了讓參與者宣洩他們的不滿，減低運動失控的情況，人民力量採納具有浄化作用的「快樂抗爭」作為它的抗爭手段。以下文章同時採用質性及質量硏究，以明情緒在社會運動中扮演的角色。 / People Power, a radical group in Hong Kong, abandoned their disruptive approach, and adopted a new tactic of social movementjoyous resistancewhich attracted large numbers of participants. In this way, People Power became an influential political lever, exerting great pressure on the government. Why did this radical political party, People Power, abandon its stance of resistance through physical confrontation, and opt for a moderate approach, joyous resistance, to express their anger and voice their grievances at the government and at the group’s antagonists? The shift in tactics has certainly been a successful one, attracting the attention of the public and helped a marginalized radical political party, People Power, to win three seats in 2012 Legislative Council Election. Although traditional theories of social movements have largely neglected the importance of emotion, the case of People Power shows that festive emotion can be an intangible resource to reduce the cost of participation when compared with confrontational tactics. The cathartic function of joyous resistance also reduces the potential for violence when People Power uses emotional appeals to mobilize the masses. In this thesis the concept of joyous resistance is introduced and the salient role of emotion in social movements is discussed, using case studies on People Power, the League of Social Democrats, the Democratic Party and the Civic Human Rights Front. Both quantitative and qualitative analysis will be conducted for the following thesis. / Detailed summary in vernacular field only. / Ng, Vitrierat. / Thesis (Ph.D.) Chinese University of Hong Kong, 2014. / Includes bibliographical references (leaves 207-215). / Abstracts also in Chinese; appendixes includes Chinese. / Ng, Vitrierat.