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Due to the complexity of wireless local area network (WLAN), the original teaching method cannot meet the needs of development of WLAN. WLAN simulation is an effective means of teaching in WLAN protocol courses. This paper introduces the principle and characteristic of NS-3, proposes using open source software NS-3 as an assistant ways to improve the WLAN teaching quality, and also discusses the application of NS-3 in WLAN education as well. An example is provided at the end of this paper.