Abstract: To solve the problems of the instability seam-tracking signal and poor welding formability of the magnetic-control sensor in submerged arc welding, a Box-Behnken design (BBD) test method was proposed. The mathematical models of automatic submerged arc welding seam-tracking of magnetic-control sensor parameters such as excitation frequency, excitation current, magnetic pole height were built and response seam-tracking and weld width values were built based on the response surface method. By examining the fitting situation of the mathematical model on the test points, the sensor parameters were optimized according to the requirement of the quality of the seam-tracking signal and weld forming. Through the optimization of the sensor parameters, the quality of the seam-tracking signal and weld fusion width were predicted in submerged arc welding. The best combination between the seam-tracking signal and weld forming was realized, so as to the seam-tracking precision of the magnetic-control submerged arc welding and the welding quality were improved.