To determine the efficacy of the 585nm pulsed dye laser in the treatment of traumatic or surgical scar. We made retrospective study with 26 patients and used 585nm pulsed dye laser (V-Star?, 7mm spot size, mean 9.3J/cm2)in the treatment of traumatic or surgical scar. Scar were evaluated before and after the laser therapy by photo graph and Vancouver Scar Scale and Color Chart Manual and Visual Analogue Scale. Three month later after the last laser therapy, final scar analysis by the blinded examiner revealed a improved patient's satisfaction by visual analogue scale and much improvement on VSS parameter(vascularity and pigmentation) and Color Chart Manual. 585nm pulsed dye laser is effective and safe in improving the quality and cosmetic appearance of erythematous and hypertrophic scar.