From birth to death, everyone is deeply concerned with medical treatment and the activities of medical research. The moral problems involved in those issues such as surrogate motherhood, abortion, the test and treatment of HIV, the use of animals in medical experiments, the right to know, and euthanasia, etc., surround us in our every-day life. As we meet these problems, do we have adequate reasons in making our decision? In this course, I hope to provide various view-points to help the students to re-think those issues. This paper is an exposition of the author's way of teaching ”medical ethics” in ”moral reasoning” in the core curriculum at Tamkang University. The content of this paper is divided into the following three parts: (1) the philosophy and the aim of the course (2) the design and the procedure of teaching (3) the outcome, and the teacher's feeling about the course