本文以顧頡剛為中心，結合家世、交游、入黨等方面探討其前半生的學術與事業，追蹤其個人思想之演變，並從中反映晚清至民國的學術與時代變遷。與一般傳記式的研究不同，本文著重利用新近出版的材料，通過史料的審定和互證，糾正以往論說的偏見與不足，展現顧頡剛疑古思想的具體形成與動態變化之過程。本文主體可大致分為兩部分，第一部分包括第一、二章，論述疑古思想形成以前顧頡剛的人生閱歷。從中可見早年顧頡剛的思想具有多樣性和過渡性的特點；而1912年加入中國社會黨的經歷對他事業心的發展則產生了深遠影響；再者，入讀北京大學期間，與胡適、傅斯年等人的交往也是其思想轉變的重要契機。第二部分包括第三、四章，主要講述古史辨運動的形成與經過。通過追溯顧頡剛認知清代學者崔述的具體過程可知，顧頡剛的疑古思想並非橫空出世，而是植根於傳統學術的新酒舊瓶。同時，本文通過回顧古史辨運動中對禹的問題的爭論，探討了該運動與近代史學發展之關聯。 / This thesis is an intellectual biography of Gu Jiegang (1893-1980), one of the most important historians in 20th-century China. By probing into Gu’s academic pursuit and career in the first half of his life in terms of family background, social network, Party membership, etc., the author tries to figure out how Gu’s personal thoughts evolved, thereby shedding light on the changes of academics and times from the late Qing Dynasty to Republic China. Unlike general biographical study, this thesis uses recently published materials, approves and mutually testifies historical records, with a view to correcting prejudices and deficiencies of past arguments and demonstrating the formation and dynamic change of Gu’s idea of ancient-doubting. This thesis consists of two parts. The first part includes Chapter 1 and Chapter 2, which mainly illustrates Gu’s life experience before the idea of ancient-doubting came into being. From this part, it can be seen that Gu’s early ideas were diversified and transitional. Later in 1912, he joined the Chinese Socialist Party, which exerted far-reaching influence on his dedication to career. Besides, Gu’s acquaintance with Hu Shi, Fu Sinian et al. at Peking University also fueled the change of his thoughts. The second part of this thesis (Chapter 3 and Chapter 4) is mainly about the emergence and process of the Movement to Study Ancient Chinese History Critically (Ku-shih-pien). By looking into Gu’s detailed cognition of Cui Shu, a scholar in the Qing Dynasty, we can conclude that Gu’s idea of ancient-doubting was actually rooted in traditional Chinese historiography itself. In the meantime, this thesis reviews the debates on Yu during the Ku-shih-pien Movement and discusses its relation with modern historiographical development. / Detailed summary in vernacular field only. / 李嘉荣. / Parallel title from added title page. / Thesis (Ph.D.) Chinese University of Hong Kong, 2015. / Includes bibliographical references (leaves 157-175). / Abstracts also in English. / Li Jiarong.