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Abstract-through the development of small and medium-sized enterprise network system of data statistics, increasingly strong demand for network out of the small and medium-sized enterprises is discussed in this paper, after analyzing the current situation of small and medium-sized enterprise network at the same time, build a set of suitable for the development of the enterprise itself the decision of the network environment is necessary; Formed through the network design, network management scheme, network basic configuration scheme based on safety, these three aspects of small and medium-sized enterprise network are discussed, using the experience and cases to elaborate explanation of various key issues encountered by building LAN; Finally conclude that a majority of small and medium-sized enterprises from the network, management, the implementation of the design phase should follow the general principles. This article mainly research in wireless local area network (LAN) in which an analysis of the small business needs, and how to form a economic, security, application of wireless local area network (LAN) system, combined with the actual simulation framework to build a safe construction scheme of the wireless local area network (wlan).