Abstract: Ninety normal subjects were determined by the respofnse of the skin to sunlight,and were classified as sun-reactive skin types of Ⅲ,Ⅳ,Ⅴ,most of them were type Ⅳ (80.11%),to the next were types Ⅴ and Ⅲ.The minimal erythema dose (MED) to UVB and UVA,and the immediate pigment darkening reaction(IPD) to UVA radiation were measured for each type.Bivariate correlation analysis showed a positive correlation between the MED UVB and MED-UVA (r=0.47d,P<O.001).The meanIPDUVA was significantly lower than the mean MED-UVA.Both mean MED-UVB and MED-UVA were significantly higher among the subjects in this study in comparison with the English people with skin types Ⅱ and Ⅲ.The validity of sun-reactive skin type in the study on photosensitive skin diseases and phototherapy is discussed.

Key words: Skin, Phototesting, Photosentitive