Abstract:Scattered point clouds of the object are obtained by 3D laser scanning,and surface fitting with point clouds and the methods to improve surface property are studied in the paper.The effect of control points,surface order and surface span on surface reconstruction precision is discussed.The number and position of the control points lead to the change of control meshes and surface fitting precision,for the point clouds including about 1 million points,if the number of quadrilateral meshes is 100,it is suitable to choose 60 to 80 control points.Surface reconstruction precision can be effectively improved by increasing surface fitting orders and spans.When the surface order is 4×4,span is 5×5,smoothness is 0.7000,the maximum error of surface-point clouds is 0.0408 mm.