Abstract: One of the important problem in the field of pipeline 3Dmodeling is how to calculate the co-ordinates of vertices on the surface of pipelines,especially surface processing of piping connections.According to the connectivity topology of pipeline networks,using the“Sweep”modeling method cangenerate the whole surface of the pipe and establish the pipe model automatically without having todeal with the issue of joining patches.Through recursion after filleting and subdividing the pipe cen-terline to establish continuous frames at sub-points,vertices on surface corresponding to sub-pointscan be calculated,and then use the boolean union method to generate pipeline joints.The results showthat the coordinates of vertices on the surface is correct,and the entire surface is continuous andsmooth.The sweeping method reduces the steps of establishing the pipe model and has a better per-formance,and it achieves a good effect in the practical applications.