Abstract: In this paper，for wireless sensor network node localization problem，four range-free localization algorithms are simply discussed.And，for the purpose of improving the positioning accuracy，an improved Amorphous algorithm is described.The simulation result shows that the improved algorithm reduces the location error and the low power of the nods greatly.It is applicable because there is no need to add anymore hardware to the network.

Key words: wireless sensor networks, localization algorithm, Amorphous algorithm

摘要： 针对无线传感器网络节点定位的问题，简单论述了四种距离无关定位算法。并对Amorphous定位算法进行改进，以提高整个网络的定位精度。仿真结果表明，改进后的算法有效地降低了节点位置的定位误差以及通信能耗。该算法无需任何附加的硬件支持，且具有较好的拓展性，对实际的应用具有积极的意义。

关键词: 无线传感器网络, 定位算法, Amorphous算法