Abstract:and the surrounding water after filling into goaf, the poisonous and harmful material leaching test werecarried out. Four general chemical indexes and six toxic ion indicators were selected, and the harmoni⁃ous degree evaluation method was adopted to evaluate the water quality of leaching water samples. Com⁃bined with the health risk assessment model, the health risks of leaching water samples were evaluated.The results showed that the leached water samples from sludge-based fillings generally met the class Ⅲwater quality standard, and some indexes exceeded the standard seriously, such as pH value exceedingthe Class Ⅴ and turbidity slightly exceeding the class Ⅲ. The annual carcinogenic risk value of heavymetals was between 4.379×10-5~9.414×10-5, which was within the maximum acceptable risk value(1×10-4~1×10-6) stipulated by USEPA, the Dutch Construction and Environment Ministry. The an⁃nual non-carcinogenic risk value of heavy metals was between 3.916× 10-9~ 8.706× 10-9, whichreached the negligible risk level stipulated by the Dutch Construction and Environment Ministry(1×10-8). In order to ensure the water quality safety of groundwater environment, it was necessary to363strengthen the monitoring and management of the items exceeding the standard and indexes with highrisk of health hazards. Close-