Abstract: In order to explore the water flow and the water resistance of the main fault in the Panbei Minefield as well as the hydraulic connection condition betwee n the C31 Group limestone aquifer in Taiyuan Group and the Cambrian system limestone aquifer, the connection test method was applied and a KI tracer was injected i n the Cambrian system observation borehole. Then the sampling and measurement was conducted at the water discharging point of the water discharging trial gateway and the variation features of the tracer concentrations were analyzed with the time passed. The results showed that there was only local hydraulic connection between t he Cambrian system limestone water and the bottom of C31 group and there was no hydraulic connection between the C11 and C21 limestone aquifers. Meanwhile it W as proved that the Cambrian system limestone water were refilled to the C31 down aquifer with different size water flow faults and the F1 fault and DF1 fault in the lime stone outcrop zone were water flow faults.