With the development of technology of electric manufacture and integrity, the bodies of wireless devices become smaller, the performance become stronger, and the area of application become wider. Composed of small wireless devices, Wireless Sensor Network (chi hair straightener) plays more important role in life and manufacture, such as environment detecting, animal tracker and so on. People also need WSN to provide more kinds of performance, such as wider chi straightener bandwidth, safer message routing, more time service, more long service time etc. But many of chi flat iron them need some basic information as supports, among them, location is especially important.The application of WSN needs the location of nodes in many aspects. In some case, the location of nodes is the key factor which decides the value of the message, and also necessary factor for finishing the next polo shirts function, such as message routing.It is very important that how to compute the location of nodes, but the nodes of wireless sensor network are limited by its resource, such as low compute level, little memory men's nike shoes size, short communication distance, short power life and so on, all these limit the selection of localization technology and localization algorithm. Currently there are many localization systems, most are in the term of testing or mode proposing, few are put into use. The main reasons are the tolerance of the technologies of ranging, the difficulties of realization and also include the complexness, the heavy workload and the high communication load.This paper analyzes the technologies of ranging, the algorithm of localization and their shortcoming and advantage.
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