提出一种算法来检测无源毫米波（PMMW）动态scenes.This算法的图像移动目标融入了背景注册，并为detection.Experiments 的结果帧差法最大互信息登记方法证明其有效性。-An algorithm is presented to detect moving targets in Passive Millimeter Wave(PMMW) images with dynamic scenes.This algorithm incorporates the maximum mutual information registration method for background registration,and frame difference method for detection.Experiments　results demonstrate its effectiveness.