The quality of follicles is often judged by gynecological ultrasound monitoring, and can also be judged by body temperature, sex hormones, secretions and other aids, see the following descriptions for details: 1. Ultrasound: Women who usually have regular menstruation can usually have ultrasound to monitor the growth and development of follicles, as well as the morphology and size of the follicles, starting from the 10th day of menstruation, to determine whether the follicles are expelled. If the follicles are able to develop to maturity, i.e. above 18mm, the quality of the follicles is good. If the follicle is not mature, it means that the quality of the follicle is not good and may be related to endocrine disorder, which requires further examination. 2. Body temperature: Often ovulation will start on the 4th day after menstruation, and the body temperature will rise about 0.3℃ after ovulation, which usually lasts for about 12 days before dropping to normal temperature. If the temperature does not rise or the time to maintain the temperature rise is relatively short, it proves that the quality of the follicle is average or ovulation does not occur; 3, sex hormone test: when the quality of the follicle becomes poor or the pituitary gland feedback inhibition becomes less, the follicle hormone will rise, these are also the basis of judgment, generally the sex hormone test on the third day of menstruation is the most reference value; 4, secretion test: generally when ovulation, the female estrogen in the body will become high, there will be sticky If egg-white like substance is found before menstruation, it can prove that the secretion of estrogen is better and the quality of follicles is also better at this time.