Abstract: From the teaching practice of Optics, this paper describes the necessity of introducing CAI method into this course. Meanwhile, the author designed and implemented the CAI system of Optics. The paper first describes the structure and the function of the system, then it introduces the technique which implements the system's function, at the end,it appreciates the characteristics of the system as well as shows the using effect in the teaching practice. It's a beneficial stride in the practice of using CAI into teaching reality.