The article, based on two interviews and related literature, reports the continuous efforts and achievements of Prof. Yuan Chang, Emeritus Professor, Institute of History, National Tsing Hua University, as a historian who devotes himself to the advancement of history teaching. It is divided into five sections. The background of the article and a brief introduction of Prof. Chang are described in the first section. Prof. Chang’s unceasing efforts of the betterment of history teaching, i.e., clarification of the meanings of history and historical knowledge, the dissemination of the teaching for the progress of students’ history thinking, and the presentations of the critical practices of history teaching are explained in the second through the fourth section. In the last section, apart from synthesizing Prof. Chang’s contributions, his expectations that history teachers should believe that the advancement of historical teaching is an endless work, and they should make piecemeal and accumulated adjustment for better teaching to develop students’ history thinking are delineated.