With the popularity of the network and the wide range of applications of multimedia technology in people's lives, how to combine modern teaching tools and media with case teaching, how to carry out case teaching under the network circumstances becomes the subject of the exploration of the teaching practice. Some practical conclusions are drawn after researching. First, the teaching performance is higher under the network environment teaching mode than the traditional classroom teaching mode. Second, students and teachers can get a better development under the network environment. Meanwhile, some suggestions are given to the case teaching mode of economic law under network environment.