The present research aimed to build a program based on the theory of successful intelligence, and measure its effectiveness in developing pedagogical knowledge of mathematics content and reflective practices among student teachers in the College of Education, and 50 student teachers from the third year students of the Mathematics Division of the Faculty of Education, Zagazig University participated in the research, and the experimental method was used by using the design of one group of pre and post measurements, the research prepared two research tools, namely: the pedagogical knowledge test for the content, and the reflective practices scale; and they were applied before and after on the research sample. The results showed that: The program based on successful intelligence theory is effective in developing pedagogical knowledge of the content of mathematics as a whole and in every dimension of (knowledge of mathematical content - knowledge of methods and strategies for teaching mathematical content - knowledge of students), and effective in developing reflective practices as a whole and in each of its dimensions represented in (reflective practices on planning procedures - reflective practices on implementation procedures - reflective practices on evaluation procedures) among students teachers in the Faculty of Education, Division of Mathematics. Key words: Successful Intelligence Theory - Pedagogical Content Knowledge - Reflective Practices