执行安全算法所引起的能量开销，对传感器节点和整个网络的工作寿命都会产生负面的影响。为了达到网络的安全性和可用性的平衡，本文首先介绍了测量安全算法能量开销的相关技术；然后，测量了多种安全算法在Crossbow节点上的能量开销，从而全面地了解安全算法对于无线传感器网络（WSN）节点各部分能耗的影响；最后，基于对测量结果的分析，提出了一些在WSN中应用安全算法的原则，对WSN中安全算法的应用是有益的补充。

The energy consumption incurred by security algorithms has negative impact on the lifetime of sensor nodes and the whole network. In order to get a tradeoff between network security and availability, this paper first introduces the related technologies on measuring the energy cost of security algorithms.Then the energy cost of some security algorithms on Crossbow node is measured. It is of benefit to know about the effect of security algorithms on the energy cost of nodes in WSN. In the end some guidelines for application of security algorithms in wireless sensor network are proposed based on the analysis of the measuring results and it is of benefit to the application of security algorithms in WSNs.