As a new form of tailings disposal and utilization,cemented tailings discharge technology is mainly applied in arid and rainless places,and the backfill body is exposed to a high-temperature environment for a long time.Based on this characteristic,this paper carried out research on the multi-scale temperature-strength coupling character-istics of cemented tailings backfill bodies.The results show that in the early stage of the hydration reaction,high-temperature curing can promote the hydration reaction of cementitious materials,thus improving the strength of the backfill body,but it will have a negative impact on the strength of the backfill body in the later stage;high-temperature curing has different effects on the amount of hydration products in the early and late stages of backfill body,but it does not affect the type of hydration products.The increase of hydration products will make the structure of the backfill body denser and the connection between particles become more solid,which is manifested as a more compact structure in SEM images on the micro level while on the macro level an increase in strength and a decrease in porosity.