Abstract: pH value of the skin surface of the face (forehead,cheok and chin) in healthy adult females was determined.The results showed that the mean pH value of the face of females in Beijing was 5.76 in November,and the values were different in different areas of the face.The difference of pH values in different age groups was not signficant statistically.The mean pH value of females was higher than that of male controls.It also showed that the pH values did not correlate to the menstrual period.The authors discussed the contributory factors intiuencing the pH value.