Abstract: In order to ensure the proper cutting and improve the cutting efficiency of welding groove along multi-pipe intersecting as well,by setting up a mathematic mode on the multipipe consistency,It is then puts forward the control algorithm of torch posture for NC cutting of welding groove along multi-pope intersecting edge.The discrete algorithm of torch posture on the basis of plasma cutting characteristics was put forward,which discreted the control algorithm of welding groove along multi-pope intersecting,the result of discretion was also given.The change of cutting speed was stimulated with MATLAB,and finally the experiment of cutting was carried out based on the control algorithm of the posture.Theoretical analysis and simulation result showed that the algorithms could disporse the torch posture efficiently based on the cutting thickness,achieve the precise control of cutting speed based on the characteristics of plasma cutting,hence,it could improve cutting quality effectively.