Mineral admixtures have become one of the most important raw materials in modern concrete. But the slags and fly ashes which were widely appllied in concrete are facing resource shortage and rising prices. In this paper, low-grade fly ash and high silicon minerals were used as raw materials to prepare the compound mineral admixtures for concrete. And the composition and properties of the prepared compound mineral admixtures have also been studied. The results showed that the compound of low-grade fly ash and high silicon mineral powders could effectively adjust the composition of compound mineral admixtures, which would make it meet the requirement of relevant standards of fly ash and compound mineral admixture. However, the workability and mechanical properties of compound mineral admixtures were somewhere between low-grade fly ash and high silicon mineral powders. And no obvious performance and functional superposition effect were observed.