Abstract
This Study was conducted in order to provide a satisfying beauty service to customers by investigating the effect of hair thickness on personality and attitude of hair style. It executed a survey of customers within the age of $20{\sim}}40$ who come and go to beauty salons, dwell in Kyeong-gi and Seoul. First, it investigated the difference of blood types depending on hair thickness. Second, it investigated how hair thickness affects on types of personality. Third, it investigated the difference of hair style attitude depending on hair thickness. We picked normal hairs for mineral test from our salon customers of the occipital region, except coloring hairs, white hairs. The hairs were picked 2 cm off from the scalp. In the result, many people with thick hair were found to have the blood type O, and many people with thin hair were found to have the blood type A. Also, in the types of personality the owners of thick hair and thin hair were highly found to have characters of both sexes, the owners of normal hair were highly found to have feminine characters. Many of the owners of thick hair appeared to prefer short hair styles, a high percentage of the owners with thin hair appeared to have long hair styles, A type people who are introspective prefer soft and long hair styles which have less movement.