Objectives The bow lines for planing craft has a significant influence on its seakeeping performance, and it is necessary to carry out intelligent optimization design for the bow lines.

Methods This study focuses on a certain type of wave-piercing bow planing craft, using the bow column angle, second-order curve shape factors, and the coordinates of the knuckle line bow control points as parameters to drive the deformation of the bow lines for parametric modeling of the bow. It validates numerical calculation methods based on model test results and establishes a surrogate model according to numerical results. The study optimizes the still water resistance and motion response amplitude in regular waves at a speed corresponding to a volume Froude number of Fr_▽ = 2.7, exploring bow designs that balance resistance and seakeeping at the designed speed.

Results The results showed the with the constraint that the resistance increase does not exceed 12%, the optimized hull form sees a reduction of about 20% in acceleration amplitude, heave amplitude, pitch amplitude and heaving compared to the initial craft.

Conclusions By optimizing the bow lines, the planing craft's low resistance is ensured while improving the motion response in regular waves, providing an intelligent optimization design method for the optimization of planing craft lines.