Research purposes: The DazhushanTunnel of theDali-RuiliRailway goes through Jiezipomultiple syncline water-rich geological structure composed of Jiezipomultiple syncline hydro -geological unit and Banjiazhai hydro -geologicaluni.t The folding and fracture structure are complicated and the karstwater is active, so there is relatively high risk forkarst tunnel construction. By researching the Jiezipomultiple syncline karstwater system and the hazard of watergushing-and -burstingwater in tunne,l the hazard ofwater-gushing-and -bursting ispredicted and evaluated effectively forhelping a safe and successful construction of the tunnel and providing the reference to the analysis of the hazard ofwater-gushing and bursting in the similarkarstwater-rich structure.