Everyone should know the three major functions of the female vagina: First, it is the channel for menstruation, which is inevitable from adolescence to menopause; second, it is the channel for sexual life. Every mature woman obtains physical and mental pleasure through sexual life, and through sexual intercourse Life comes to completion. The important task of reproduction; finally, it is the passage for the birth of the fetus. Therefore, the growth of the human female pelvis, although various diameters vary during the period, is suitable for the fetus to be delivered from the mother\’s body through rotation and descent. After we become pregnant, various organ systems in the body will undergo a series of changes due to pregnancy. These changes are for the healthy growth of the fetus and for the delivery of the fetus.