Abstract: Under the background that the education reform of new times and new engineering is imperative，combining with the characteristics of college physics teaching in our engineering-dominated university，the reform of“college physics teaching system of new times and new engineering”is proposed. The new times require engineering graduates to better understand modern cutting - edge technologies. On the basis of the original college physics teaching，we have expanded a series of new technologies related to modern physics. This paper takes quantum communication technology as an example. Quantum communication is a new cross technology which combines quantum physics and classical communication. Due to the features of“indivisibility”，“uncertainty”and“No-Cloning Theorem”， quantum communication can realize unconditional security， making it a new security communication technology. As one of the quantum technologies，quantum communication has always given people the feeling of“Unattainablez”，which makes non-professional people flinch. This paper is just to explain the basic principles of quantum communication in a simple way. These new technologies are added into the old college physics teaching，making college physics closer to the frontier technology.

Key words: quantum communication, single photon, polarization coding, BB84 protocol