The shrinkage rate of follicles in a day is around 0.2-04cm, which is normal. When a woman is in the follicular growth phase, that is, the first half of the menstrual cycle, after menstruation under the influence of follicle stimulating hormone, the follicle grows day by day, and grows up to 1.8-2.5cm, then it will be normal for ovulation to take place. If the follicles do not grow and shrink, ovulation and fertilization will be affected. When the follicles shrink, they can be dynamically monitored by ultrasound, and if they are caused by insufficient levels of follicle stimulating hormone, they need to be given appropriate hormone treatment to promote the maturation of follicle development. During the treatment period, women should pay attention to maintain a regular life, ensure sufficient sleep, work and rest and relaxation, nutrition should be reasonable, comprehensive and diversified, which is also conducive to the normal growth and development of follicles.