Abstract:Through geological analysis and geophysical research, by means of controlled source audio frequency magnetotelluric sounding, it is regarded that Sinan hot spring recharge source is from the hot water rising along Yingtao fault zone in the core area of Shagou syncline in its western part. It excrets from the fracture zone in the core of Yingwuxi anticline to the surface. Through water quality of water samples of Sinan hot spring in Guizhou province, by using geothermometer method, it is regarded that heat reservoir temperature is 53℃, and the hot water cycle depth is 1159m.