Abstract: The antiherpes virus effects of Tai-Ding-An (TDA) were studied in experimental herpetic keratitis in rabbits. Topical treatment With 1% or 2% TDA ointment 4 times daily was initiated 48h after virus inoculation in rabbits. Significant efficacy was obtained with herpetic epithelial keratitis. Responses to treatment with 2% TDA ointment were similar to those with 0.1% CC ointment. But 0.5% TDA ointment showed no significant effect. 1% TDA ointment was also not efficacious in the topical treatment of herpetic stromal keratitis in rabbits.