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Worldwide wireless LAN technology has rapidly developed into a vital part of the computer network, its applications are also rapidly expanding, with the IEEE802.11wireless LAN standard-setting success, wireless technology has emerged from the pastkind of incompatible state, and thus unable to cable system installation areas reliable mobile network interconnection scheme.The wireless network is easy to install, flexible, economical and easy to expand, etc., provides a potential means for communicating mobile, personalization and multimedia applications. This paper first introduces the basics of wireless LAN, and understanding of the overall condition of the wireless LAN and relative to other technical advantages. And then focuses on the design process of a wireless LAN, how to determine the design methods, design rules specific to wireless networking, wireless network and wired network combination, for instance through a wireless local area network engineering to understand the background of this project and an overview of the functional requirements analysis, the project system planning, overall project design, wireless network system design and implementation, which gives a complete wireless LAN network engineering design of key technologies. Finally, the combination of wireless LAN some shortcomings in the prospects for future wireless LAN further outlook.