本文以北京市海淀区为例，把变化向量分析方法引进到了当前国内的土地利用／覆盖变化监测中，针对变化向量分析方法中变化阈值确定的难题，提出了一种双窗口变步长阈值搜寻的新方法，从海淀区的实例研究结果看，变化的检测精度可以达到87％以上，表明变化向量分析法在解决阈值问题后，确实可以有效地提取土地利用／覆盖变化信息。

Change Vector Analysis (CVA) is a valuable approach for land use/cover change detection, in which how to determine change magnitude threshold and change direction reasonably is already becoming an obstacle for its widely use. Therefore, a new method named Double Windows Flexible Pace Searching is proposed in this paper aimed at determning change magnitude threshold reasonably and efficiently. As a result from the case study in Haidian District, Beijing, the accuracy of change detection is obtained about 87%, which indicates that the Double Windows Flexible Pace Searching method has potential utility in Change Vector Analysis for land use/cover change detection.