Taking the self-developed and designed low-nickel nitrogenous austenitic stainless steel self-shielded fluxcored wire as study object, the effect of laser-MAG arc hybrid heat source surfacing parameters on bead penetration and depth-to-width ratio were studied. The results show that the laser power, overlaying current and arc voltage have significant effects on the penetration and depth-to-width ratio during the hybrid heat source surfacing, and the effect law is closely related to the laser-arc position; changing the laser-arc distance can adjust the penetration and depth-to-width ratio, and then affects the dilution rate; laser front and DLA（laser-arc distance）<0 mm are more beneficial to reduce the penetration and depth-to-width ratio. The dominant mechanism of penetration and depth-to-width ratio differs with different surfacing parameters. When DLA <0 mm, laser power <2.0 kW, current >160 A and voltage <28 V, the arc dominates the penetration and depth-to-width ratio; conversely, the laser dominates the penetration and depth-to-width ratio.