The ideological and political theory in colleges and universities is a key course to implement the task of building morality and cultivating people, and it is related to the strategic overall situation of realizing the great rejuvenation of the Chinese nation. Therefore, improving the affinity of this course is an important aspect in the process of deepening course reform and innovation. This paper deems that the affinity includes not only the "harmonious force" between teachers and students, but also the "joint force" of some key factors such as educational content, educational methods, and educational environment. In fact, there are problems of insufficient "harmony" and "joint force" in the process of course teaching and educating students. In this sense, some suggestions are put forward, which are based on the phenomenon such as some teachers’ poor leading ability, some students’ inaccurate cognition of the teacher-student relationship, the slow update in teaching content, the inflexibility of educational methods, the insufficient harmony in education environment, etc. It follows that it is necessary to continue to improve the quality of teachers and students, so that the affinity of ideological and political theory courses can be improved in colleges and universities. It is also important to strengthen the "harmonious force" forged by teachers and students. Besides, it is critical to optimize the allocation of some key factors and enhance the "joint force". In this sense, the construction of ideological and political theory courses can be promoted via the integration of "harmonious force" and "joint force" in colleges and universities.