Abstract: Spiral coil pipe is shaped by means of utilizing the effect of intermediate frequency induction in order to quickly heat the limited area of a steel pipe, making the heated pipe within its plastic deformation range follow the preset track at a definite speed. The respective analysis of the essential factors in the technological process including the positions of the supporting wheels, the pressing wheels and the sustaining wheels, the interaction among the bending thrust (F).the bending moment (M), the screw-pitch of spiral coil pipe (h) and the bending radius of the level circle (R) reveal that the quality of spiral coil pipe depends on the factors such as positioning the heating ring, the heating temperature, the speed of thrusting the spiral coil pipe forward, the welding quality of the pipes.the straightness of the pipe itself and the straightness of the butt welded two pipes and so on.