The paper reports the preliminary results of ultraviolet erythema on the skin irradiated with 308 nm excimer lasor light. Using white porkel as an animal model, we obtained the data on the injury thresholod of the skin. 95% fiducial limit of MBD50, in which energy will result in 50% perceptible redness occurence rate in all points irradiated at this exposure dose, ranges from 45.97 to 63.05 mJ/cm2.