A window extraction method of building facades from ground laser point cloud data is proposed.In view of the situation that the windows contain point clouds,the feature analysis and invalid point removal of point clouds on building facades are carried out first.Because the depth difference between windows,exhibition stands and other concave and convex features and the wall surface of building facades exists,dual depth images of building facades can be generated by distance weighted reciprocal IDW interpolation method based on these features,and then processed by threshold segmentation,median filtering smoothing and morphological filtering,etc.,find the point cloud and boundary in the window.For window voids,the TIN can be used for boundary extraction.Since the edge length of the window boundary points is much larger than the peripheral points of the window,the window boundary points can be found based on this.By experimenting with the measured point cloud data,the extracted effect is compared with the actual situation.The results show that the method can effectively extract the window.