Abstract:The plane feature extraction of 3D laser scanning is an important component for 3D modeling,which also is a significant field of research.In the building plane extraction process,against traditional point-by-point region growing will make the fitting plane and real point cloud plane deviation,lead to the adhesions between the surface of the block,this paper presents a detailed lines region growing method,considering the building plane has a regular shape,and the plane ba straight line, so in the growth process of joined the flat shape the a prior conditions.The experimental results shows that this method can eliminate the adhesion between the surface of the block, and effectively improve the accuracy of the plane extraction.