Since it was proposed by President Xi in 2016 that class is the main channel for ideological and political work to run through the whole process of education and teaching, ideological and political courses have become an important part of higher education in the new era, and an important way to educate all members of higher education in the whole process and all directions. It has become an inevitable trend for colleges and universities to carry out ideological and political education in courses. However, due to the characteristics of the knowledge attributes of the engineering courses, there are difficulties in ideological and political teaching, such as excavating elements, integrating the teaching process, and determining evaluation criteria. All those difficulties led to the unsmooth development of the ideological and political teaching of the courses. Based on how to build the ideological and political teaching framework in the whole process of a course - Engineering Graphics, in the paper, we show the construction methods and actual cases of each link of the course, from the excavation of the ideological and political elements of the course to the reform of the course teaching practice, as well as the evaluation of the ideological and political teaching effect of the course. These represent the attempts in the ideological and political teaching practice of Engineering Graphics. The ideological and political elements in Engineering Graphics can be excavated in three ways: the first one is from the overall development history of the course. In the history of the course, valuable ideological and political education elements can be excavated; The second is to analyze the traceability and application background of curriculum knowledge points, and find the world outlook and methodology contained in the curriculum knowledge points; The last way is from the perspective of curriculum development and innovation, we found the ideological and political education connotation of the curriculum in the actual cases. The ideological and political teaching of the course can be practiced from two aspects: classroom teaching and evaluation. This paper introduces the teaching methods adopted by the course team in and out of class teaching, which includes how to prepare the supplementary materials of the course, and how to design the strategies for evaluating the effect of ideological and political education. Specifically, the ideological and political elements of the curriculum are fully prepared first. Then, the ideological and political teaching methods are designed in chapters according to the characteristics of these elements. The ideological and political teaching elements are designed into the teaching process links inside and outside the classroom, which cover the whole curriculum; Investing more energy in the construction of supplementary materials of course, and putting the elements and methods of ideological and political education into the supplementary materials, will make up for lack of ideological and political elements in the textbooks; The evaluation strategy based on students' participation is adopted, and the main criteria for evaluation are whether students participate and how enthusiastic they are to participate. The difficulty of evaluation for the teacher is reduced, and students' enthusiasm to complete the curriculum's ideological and political tasks s improved. Engineering Graphics is a representative professional course for engineering majors. Based on the practices of the course group, we propose a path to excavate the ideological and political elements of the course and teaching methods, which can be used as a reference for ideological and political teaching of other courses of engineering. The paper also provides ideas for solving the difficulties encountered by teachers in the process of ideological and political teaching.