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.