As a core course of the Internet of Things specialty curriculum system, wireless network technology course is difficult to learn. The main reason is that learners can not do experiment at any time anywhere because of no equipments for experiment. In order to solve the difficulties discussed above, a network simulation system named ENSP is introduced in this article. ENSP mainly simulates enterprise routers, switches as close to the real hardware as it possible, which makes the lab practice available and easy without any real device. So it provides great convenience to wireless network researchers. The application of the network simulation system is putting the theory of “teaching-learning-doing” into practice. It can enhance the students learning interest, and also obtained the good teaching result.