Improving morality of college students is one of the goals in teaching ideological and political course. To achieve this goal, teachers with affinity in ideological and political course should inculcate the concept to students and give students much more help in all aspects. This paper, from the following four aspects, illustrates that teachers of ideological and political course should consciously exchange and communicate with students so as to develop the affinity and help college students grow healthily while completing the teaching goal of ideological and political course. These four aspects include the multi-roles of teachers in the classroom, extension of in-class teaching, flexible use of social exchange and formation of psychological contract mechanism between teachers and students.