The fellowing is the conclusion of this study thesis. 1. Looking at the rate of middle school girls’ was leave experienced menstrations, the first school year is 47.1%, the second 92.7%, and the third 97.2%. 2. Most of the first menstrations appear to about 14 or 15 year-old-girths in the second year of middle school. 3. The symptoms during the menstrual period show lumbago or nervousness. And about two thirds of those who are menstrating are interested in menstrations. 4. A lot of girls have ever experienced irregular menstrations for abour 4 or 5 days. 5. Most of then have the wrong recognezation about menstration. and they say their conditions of psychology during the menstrual period feelsick, harmful, fearful, uncomfortable, so so, etc. 6. They had physical training class without any conditions during the menstual period and they hope to look it on. 7. They think that a body is injured by activities during the menstrual period and then they feel sic or not. This is the contrast opinion each other and it has both faces. 8. 36.3 percent girls of those who have ever menstrated have ever sufferred a loss of physical education class. And it is called a lot of loss, so it is keenly acguire to decrease the loss of physical education class.