Open teaching is a pedagogical approach centered around student development. By creating an open environment, teachers guide students in learning independently and cultivate their innovative thinking. Here, the open teaching method is applied to a course of two-dimensional physics based on four aspects: course content, teaching methods, course experiments, and course examination. To design the diversified course content, teachers integrate basic knowledge of undergraduate physical courses with cutting-edge scientific advancements and exploratory experiments. Meanwhile, the advantages of the state key laboratory are utilized to cultivate students comprehensive abilities in multiple dimensions. Application of open teaching to this course has produced a good teaching effect and paves the way for further teaching practice of open teaching in other extension courses.