Teaching for undergraduates in the College of Astronomy and Physics for seniors, the experiment purchased 3 sets of BBO quantum entanglement sources and 3 sets of spatial polarization quantum cryptography experimental devices. The course is divided into two semesters. Each experiment is about 12 class hours, and each device can accommodate 4 students carry out experiments. The experimental device adopts an open design, which can be used as an extended experiment for courses such as optics, or it can be set up as a separate experimental course.