Abstract: FDS chipless self-tapping screws are widely used in the new energy automobile manufacturing industry as a thin-plate connection fastener. Aiming at the influence of the quality of threaded holes on the strength of self-tapping screws, the Box-Behnken method is used for self-tapping screws. Research on cold extrusion process. Through the combination of response model, numerical simulation and experiment, the relationship between frustum angle, extrusion speed, frustum height and friction coefficient, forming quality and forming load was studied, and the optimal parameter combination was obtained: frustum angle. The angle is 20.16°, the height of the frustum is 6.12 mm, the extrusion speed is 616.28 r/min, and the friction coefficient is 0.36. It is verified through experiments that the thread connection strength under this optimal parameter is good and the thread profile is full, which can effectively reduce the forming load.