Student teachers’ internship is the key and difficult points of the reform of pre-service teacher education. To further strengthen the theoretical thinking of student teachers’ internship can provide a theoretical basis for the reform of internship scheme and the development and reform of the whole teacher education. With the best evaluation grade in the UK, the internship scheme of Cambridge University has taken advantage and applied such theories as follows: the theory of"Reflective Practice"of Donald A. Schon, an American scholar, the"Code"theory of Basil Bernstein, a British educationist, and the theory of"Knowledge Form"and the perspective of"Neo Rationalism"of Hirst, P.H, a British educational philosopher. All of these theories radically emphasized the concept of"integration", especially the fusion between theory and practice during the process of educational internship has been a great concern.