Abstract: In order to improve the undergraduate classroom teaching effect of major courses of solid mechanics, to better consolidate basic knowledge for students, to build a logic system of professional knowledge, the teaching concept of pursuing essence and origin is proposed to follow the great pioneers footprint, to cultivate the students' cultural confidence and patriotism, and to explore the path of knowledge service to humanity. In this teaching concept, to obtain the logical idea of course teaching, the historical starting point of teaching objectives is analyzed, and the original intention and process of establishing the knowledge system is tracked. This teaching concept includes of collection of knowledge origin, basic lecture in class courses, logical arrangement of knowledge system and the humanities and history education. Therefore, the teaching concept proposed in this paper can realize the essential goal and original intention of imparting knowledge and answering doubts in undergraduate education, and implement the basic teaching and student-centered teaching concept of undergraduate education.