拉阿魯哇族於2014年被認定為台灣第15個原住民族，然而拉阿魯哇族長期與布農族混居，在通婚、轉語的情況下使得拉阿魯哇族的民族邊界混淆不清，而當代唯一剩下尚可作為我群判準的則為氏族組織。本論文即透過系譜訪談以及日本時代戶籍資料的交叉比對，完成拉阿魯哇族各氏族之系譜，並以此探討當代拉阿魯哇族人對其民族邊界的認知與構成。 拉阿魯哇族人普遍並無傳承系譜之習慣、亦無職司系譜傳承者，整體而言對於氏族與祖先的記憶是相對殘破的。而在系譜訪談期間亦發覺拉阿魯哇族的部分氏族之內涵存有混亂、錯植之現象，深究其原因則發現主要是導因於氏族名、日本姓、漢姓於寄留、入贅時的轉換，以及氏族、四系統、日本戶籍姓氏登記的概念混用。此外，甚至有數十年前還存在之氏族已徹底被族人遺忘、或者如那瑪夏拉阿魯哇族人已喪失其氏族、民族記憶之情況。 面對語言丟失、組織脆弱、氏族模糊的情況，當代拉阿魯哇族人的民族危機感增強，開始試圖補強其民族邊界，並在聖貝祭場上以具象化的氏族家屋形式展現出拉阿魯哇族人對我族邊界的界定。目前，拉阿魯哇族人主觀上對民族邊界採取的是較為寬鬆的父母雙系之標準，包含昔日入贅外族者，只要自身願意認同則努力將其視為拉阿魯哇族人。 This thesis studies the ethnicity border of Hla’alua in the present age. Hla’alua is a newly recognized 15th aboriginal peoples in Taiwan in 2014, but Hla’alua people have mixed with Bunun people for a long time. After intermarrying and turning language, the ethnicity border of Hla’alua became blurred, and the only criterion left today is their clan system. This thesis makes use of the data acquiring from interviewing Hla’alua people and the household registration of Japanese ruled period to complete the family tree of each clans in Hla’alua, and using them to discuss the cognition and constitution of the ethnicity border from Hla’alua people in present. Hla’alua people do not have the tradition to pass down the knowledge of family tree, and the average memory to their clans and ancestors is vague. The research reveals that Hla’alua people’s acknowledgements of part of their clans are confused. It can be concluded that is result from two reasons: (1) the transferring of Japanese family name, Chinese last name and clan’s name (2) the misunderstanding of the concepts of the clan, the four systems of Hla’alua and the family name registrated in the household registration of Japanese ruled period. Furthermore, even some clans still existed decades ago could be forgotten, and Hla’alua people lived in Namasia area even forgot which clan they belong to. It shows that Hla’alua people now accept child as one of them either their father or mother is Hla’alua, even including matrilocal man. The problems that their language is endangered and the clan system became unsolid have awaked the sense of crisis, and Hla’alua people start trying to reinforce their ethnicity border. They also make a concrete demonstration of their ethnicity border they defined through the houses of each clan on their own festival “Miatungusu”.