Basal body temperature is the body temperature measured after 6-8 hours of adequate rest, before getting up, eating or talking. In normal women of reproductive age, the basal body temperature is slightly lower after menstruation and may be even lower on ovulation day. After ovulation, the formation of the corpus luteum of the ovary and the secretion of progesterone increase the basal body temperature by 0.3 to 0.5℃ until the onset of menstruation when the body temperature drops to the pre-ovulatory level. Under normal circumstances, the curve of basal body temperature changes in a woman during a menstrual cycle is biphasic, as shown in the figure below. By measuring basal body temperature, we can understand the presence or absence of corpus luteum and luteal function, and thus the presence or absence of ovulation and the estimated date of ovulation. Therefore, it is very important for the diagnosis and treatment of patients with ovarian dysfunction and infertility and to observe the efficacy of the treatment. Women who wish to monitor ovulation by basal body temperature should follow the instructions below: 1) Prepare a thermometer and master the reading method to ensure accuracy. 2. Place the thermometer at the side of the bed where it can be reached and shake the mercury column down every night before going to bed. 3.Every morning after waking up, immediately measure the temperature in the mouth for 5 minutes. If you can take the temperature at a fixed time every morning (5:00~7:00), it is better. It is strictly prohibited to get up, urinate and defecate, smoke, eat and talk before taking temperature measurement, and the temperature data will be accurately recorded in the table prepared after measurement. 4.If there is sexual life, it should be indicated in the table. 5, cold, alcohol, late sleep, insomnia and other circumstances, often affect the body temperature. It should be written in the notes for reference. 6.If there is an increase in leucorrhea and thinness during the cycle, such as egg-white, clear, transparent, long-drawn, etc., or if there is a temporary vague pain or a feeling of falling in the lower abdomen, or if there is pink or light red leucorrhea, or if there is vaginal bleeding, or if there is an increased libido or other abnormalities, these should be noted in detail in the remarks. 7. The start and stop dates of examination, treatment and medication should be indicated in the remarks. 8.Each menstrual cycle should be recorded on a table, starting from the left side of the table, with x indicating the beginning of the menstrual period, the table on the previous page can be used for three cycles, if there is no cycle, it should be recorded continuously. The following symbols can be used to record the contents to be indicated in the commentary items in the chart: ◎ indicates the day of sexual intercourse, indicate the time × indicates the period, “××” when the amount is high, “.” when the amount is low ↑ indicates the beginning of treatment for symptom examination ↓ indicates the cessation of treatment or Discontinuation of medication The form should be printed and given to the doctor during the visit to facilitate diagnosis and treatment.