Abstract: On the basis of analysis and research to the stability of the Dadonggou dumping ground in Nanfen iron mine, Benxi City, Liaoning Province, with scientific forecasting, suggestions and measures are put forward to landslide preventing and controlling. It is concluded that, in the condition when the stability factor is more than 1.1 and water-free, the dumping ground will remain stable. To prevent geological hazard of landslide, the problems of the dumping ground should be tackled in a comprehensive way.