Ovulation body temperature measurement mostly adopts the basal body temperature method, which needs to be measured in a quiet state, choosing to measure the basal body temperature every day before going to bed or after waking up in the morning, and choosing to measure the oral temperature or axillary temperature, and then record the results of the test and tracing them into a graph. Before ovulation, the body temperature is usually around 36.5℃, after ovulation, due to the effect of progesterone, the body temperature will rise to around 37℃, with an average increase of around 0.5℃. The high temperature phase usually lasts until the next menstrual period, and if pregnant, the high temperature phase will continue without dropping, and if not pregnant, the temperature will revert to the original level. Due to individual differences, the basal body temperature of each woman is not the same, and needs to be monitored for three consecutive cycles to be able to accurately project the date of ovulation, determine whether there is ovulation based on the measurement of the basal body temperature, and also indicate whether there is luteal insufficiency and irregular shedding of the uterine lining and other conditions.