To recycle wetdischarged flyash and carbide lime effectively, a highlyactivated mineral admixture slurry consisting of both these components was investigated. The preparation technology of mineral admixture slurry made from a composite of wetdischarged flyash and carbide lime and the strengths, hydration products change (XRD, SEM) of cement paste made by the slurry were studied. The results indicate that the optimal proportion between wetdischarged flyash and carbide lime (solid content) is 75:25 in the process of wetmilling preparation. The alkaline environment provided by carbide lime with high Ca(OH)2content and cement hydration accelerated by modified agents can promote early activation of flyash, and accelerate its secondary hydration reaction.