Abstract:The Debris-flow is a kind of commonnatural phenomenou. Debris-flow forecasting, as an very important countermeasure for disasters mitigation, becomes a focus field of debris-flow research at home and abroad. This paper introduces the background knowledge of debris-flow forecast including its definition, type and forecasting level. A view to the international developing situation has been given. The main research results in this field in the recent years are introduced in China. Finally, some suggestions on the further development of debris-flow forecasting theories and technique are proposed.