The replenishment source of Xidatan drinking mineral springs in island permafrost area on north slope of the Kunlun Mountains are mainly the melting water from the modern glaciers bottom, snow and ice melting water, atmospheric precipitation, and surface water in Yuzhu Peak area on the Kunlun Mountains. This scenario is based on the survey of hydrogeology, water-conducting and water-controlling faults, and water chemistry, and on the EH-4 high-frequency electronic deep exploration. The original water recharges the deep groundwater at fracture zone of active normal faults F3 and F4, then groundwater enriches at normal faults F2 and F2-1,2, and then run northward. A water-rich triangle area is formed when groundwater reach the active reverse fault F1. Groundwater then discharges through fracture zone of F1, which is the major cause of the Xidatan mineral springs formation.