研究了动态业务下 ,无波长变换的波分复用全光网采用固定选路时的波长分配问题 ,提出了一种中心式的波长分配算法—最小影响算法。该算法能精确地描述某个波长的分配对全网状态的影响 ,因而能够更有效地使用网络资源。计算机仿真表明 ,如果用阻塞概率来衡量 ,该波长分配算法优于文献中已有的典型算法 This paper studies the problem of wavelength assignment in WDM optical networks without wavelength conversion under dynamic traffic, and proposes a center-based wavelength assignment algorithm-least impact algorithm. The algorithm can accurately describe the effect of a wavelength allocation on the state of the whole network and thus can use the network resources more effectively. Computer simulation shows that if the blocking probability is used to measure, the wavelength assignment algorithm is better than the typical algorithms