The present invention provides a basal body temperature analysis system. The basal body temperature analysis system comprises an analysis unit, a router, a measurement unit, and a portable electronic device. The analysis unit is established in an internet server. The router is connected with the internet server by internet. The measurement unit comprises a basal body temperature measurement device and a wireless communication module. When the basal body temperature measurement device provides basal body temperature information, the wireless communication module transfers the basal body temperature information to the internet server through the router. After analyzing the basal body temperature information, the analysis unit will transfer an analyzed information to a portable electronic device.
