This article summarized that professor YOU Shaoling used assay of BBT and follicular monitoring to analyze the cause of infertility and proposed that there were several kinds of infertility,including follicles growing fast,follicles growing slow, flat follicles, thin endometrium, thick endometrium, luteal dysfunction and made syndrome differentiations of these kinds of infertil- ity. Meanwhile, patients were assigned to inject HCG reasonab...