The wireless bureau area net(WLAN) is the outcome that calculator network and wireless corresponds by letter a technique to combine together.It makes use of a radio frequency (RF) technique, carrying out the correspondence of of calculator by wireless' many address letter's way of the way.The IEEE released the WLAN standard IEEE802.11 to rule physical layer and medium to visit control son the technical specification of the layer(MAC).802.11 contain two kinds of correspondence methods, 1 kind is a distribute type coordination(DCF), another 1 kind orders a coordination method(PCF).Distribute type coordination(DCF) is according to have a conflict examination to carry many road interview of an interception a method(CSMA/CA).The method(PCF) of ordering the coordination means the adoption round inquires a way, the wireless connects in to order equipments periodic ground to send out a signal test, passing a test to identify for the network with each wireless equipments, network management parameter's etc. carry on handing over with each other.Because the wireless network customer increases, putting forward in the wired network of business request, such as video frequency, speech...etc. solid hour the business is in the WLAN also good arrive satisfy.These can provide a dependable cent set to deliver, postponing while delivering low and tremble to move small, make it the demands of contented QoS(Quality of Service).