Abstract: For the accurate evaluation on risk level of break-dam in mine tailings pond， a GA-AHP and cloud-matter element model was established. The major risk factors on break-dam were identified by using the Delphi method， and the risk evaluation index system of break-dam was established. The index weights of break-dam in mine tailings pond were calculated by using GA-AHP. The evaluation index was classified to establish the risk assessment model based on the GA-AHP and cloud-matter element model. The established model was applied to practical case， and the Matlab software was used to calculate the subordinate degree. The results showed that the risk of break-dam in the mine tailings pond is normal and the evaluation results are consistent with the practice.

Key words: mine tailings pond, break-dam risk evaluation, GA-AHP, cloud-matter element model, subordinate degree