Abstract Organic chemistry is the major course of chemistry and other related disciplines. It is difficult for students to learn organic chemistry well, because of the abundant and complexed contents. With the purpose to help the students to learn organic chemistry well, we assigned the contents of organic chemistry with a number 12410100150, which is just like a mobile phone number. "1" represents a learning objective; "2" represents two hands; "4" represents four kinds of spectroscopy; "10" represents basic theories; "100" represents the different types of reaction mechanism; "150" represents different types of reactions. After several years' of practice, we found that students could remember the meaning and contents of this "mobile phone number" and learn organic chemistry much more effectively.
