Abstract: We present a method for complicated planar building reconstruction from airborne LiDAR point cloud data.Firstly,the extracted building points are clustered into the different plane point sets.Then,those points in point set are fitted into plane.Every planar boundary is decided by multi-planes intersecting.From every planar boundary and the height of ground around building,we can calculate the 3D coordinate of every corner point parameter in building reconstruction.The building model can be reconstructed using these parameters.The experimental results show that this method is able to reconstruct effectively complicated planar building model.