In order to better and safer use the industrial waste slag in architecture, the paper studied the high temperature property of composite micropowder concrete with steel slag,powder slag and of fly ash. Taking four different kinds of composite powders as research object,it analyzed the effect of composite powder type and dosage on the high temperature back properties of concrete. The results show that the addition of composite powder to concrete will increase weight loss rate.For the composite powder concrete mainly with steel slag or fly ash, the mixture amount of composite powder has negative relation with the residual compressive strength of concrete and static elastic modulus. For the composite powder concrete mainly with slag,the composite powder content has positive relation first and then negative relation with the residual compressive strength of concrete and static elastic modulus.