['In order to search a safer argon laser photodynamic method, this study used 488 nm wavelength and common mixed spectrum argon laser PDT for treating Port Wine Stain. The therapeutic effects and side effect were compared.', 'Fifty two cases of PWS were divided into two groups randomly. Argon laser PDT by two ways of laser irradiation were used.', 'Our data revealed 19.23% cure rate in 488 nm laser PDT group, while that of mixed wavelength laser group was 11.54%. There was no significant difference in the two groups. Also the effective rate of 488 nm laser group was 92.31% and that of mixed group was 88.46%. But the difference was not significant statistically. Side effect occurred often in mixed spectrum laser group. That was 57.69% for mixed group, 38.46% for 488 nm group.'] Do [ Comparative research on mixed and 488 nm argon laser PDT for port wine stain ]?