● ● judges the main method with corpus luteum insufficient function. Usually, but menstruate cycle is too short, the dripping wet before classics bleeds, bear period woman infecund or the habitual abortion. Judge whether corpus luteum function is insufficient, need to measure fundamental temperature, if temperature of corpus luteum period is short at 12 days. Or temperature rises slower, drop earlier, ascendant extent is less than 0.5 ℃ . Or wave motion of temperature of corpus luteum period is bigger, all be the expression with corpus luteum insufficient function, but need to notice to should determine continuously 3 menstruation cycle just can decide. In addition, menstruation comes tide takes the film inside the uterus inside 12 hours, if expression is,secrete undesirable, also can serve as reference.