Clinical practicum is essential in development of clinical competencies for nursing students in nursing education. Within a few weeks of clinical practicum, to help students to adapt to clinical environment and achieve educational goals is a great challenge for clinical instructors. Application of appropriate learning theories to clinical teaching may help teachers explain how the students acquire, organize and apply knowledge and skills, and use the information for planning teaching plan, in order to achieve the desired goals. In this paper, the author would like to share the experience of using theory of cognitive apprenticeship in supervising fundamentals of nursing practicum of nursing students in a five-year junior college. Components of the theory, steps of applying the theory, application of teaching strategies, and students learning outcome will also be elaborated.