The remelting process in selective laser melting (SLM) significantly influences the surface precision of fabricated samples. This study numerically simulates and experimentally investigates the impact of varying remelting times, powers, and scanning methods on the quality of Ti6Al4V single tracks produced by SLM. The results show that at laser powers below 250 W, increasing remelting power, the number of remelting passes, and altering the remelting direction can enhance the surface quality of the single track. Additional remelting passes reduce surface defects within the melt track. Among the tested methods, round-trip remelting scanning is most effective for improving surface quality. Changes in the weld pool width are identified as the primary factor affecting the melt track′s surface quality. Furthermore, an increase in remelting passes leads to the expansion of β phase grain boundaries and an increase in α phase transformation.