The pedagogical transfer has brought learners opportunities to approach quickly and systematically the knowledge that has been acknowledged by all human beings. However, that process has made the knowledge on longer the same as its origin
in fact, there're sometimes wide disparities. A very typical example is the knqwledge about logarithm, which has been presented in the current high school mathematics syllabus. Aiming to retrieve the meanings as well as the roles of logarithm, the article will discuss the appearance of logarithm in history and its main roles as a tool through outstanding applications.