Abstract: As a practical activity, "two-subject" teaching aims at developing, educating and remoulding people. It is a combination of reality of educational contents, character power of educator and flexibility of educational methods. Teachers’ character power in "two-subject" teaching has the following important functions : First,it ensures the accomplishment of all the tasks of ideological education and the realization of its purpose. Second,it is the prerequisite and condition of developing truth power in "two-subject" teaching.Lastly,it is the key to "two-subject" education’s bringing about infiltration power and tension.