Abstract: Considering the relationships between rail transit networks and groundwater aquifers in the city of Xian, the effects of rail transit network planning implementation on ground recharge, runoff and discharge were analyzed. The impacts of rail transit network construction on groundwater flow fields were simulated using Visual MODFLOW. The results show that influences occur in the unconfined aquifer and thus several enclosed square-formed areas are formed. It can reduce wetted area of the aquifer to some extent and lead to variations of ground water level in some areas. But whether in elevated areas or declined areas of water level, the groundwater level ranges from 0 to 1.25m.