Abstract: Hydraulic conductivity is an important coefficient in groundwater resources research.In general,this parametert is gained through pumping tests.But this kind of methods has restriction because hydraulic conductivity is of spatial variability.CFCs method is a new way of dating the groundwater age through measuring the CFCs concentration in groundwater.It can be used to date the age of young groundwater recharged by modern water since the 1950s.Using the CFCs age-dating data of groundwater in the Jingsheng Basin in Shanxi Province,the flow rate is estimated in the paper.On the basis of the estimation,the hydraulic conductivity is calculated,which is used in the numerical model.The results show that the groundwater age is small,about 20 years in the recharge area.The groundwater in the deep confined aquifers has poor recharge resources and is almost "old water" of about 43 years.From the top to the bottom of the flood fan,the rate of groundwater movement becomes small,and the hydraulic conductivity becomes small as well.From north to south of the basin,the flow rate and the hydraulic conductivity have a tendencey to decrease.The hydraulic conductivity calculated with this method matchs the actual aquifer configuration of the Jingsheng Basin.