The paper reviews of the constructivist view of mathematics and mathematics education. First of all, we shall study how mathematics has been treated as an object of cognition in philosophy or cognitive theories, what is changed in modern mathematics. It can lead us to understand the constructivist perspective on mathematics. Secondly, we will examine the view, the teaching and learning principles of mathematics education based on constructivism. Didactic transposition theory will be used as a frame of reference for this examination.