A double blind study with systemic psoralen and sunlight exposure therapy in psoralen and is reported. Evaluation was done on the basis of clinical features, patients subjective improvement, severity of scores and histopathology. 66.7% of patients on systemic psoralen and sunlight responded with complete clearance of lesions in 21 to 56 days and 33.3% of patients showed moderate improvement. This study shows that systemic psoralen and direct sunlight elwsure is a safe and effective line of t reatment for psoriasis. We feel, this method of treatment can be recomended as a routine in psoriatic patients in our country.