Ceramic wastes containing 18%（by mass） Al2O3 were used to replace quartz sands containing 94%（by mass） SiO2 in autoclaved aerated concrete (AAC), and the influences of ceramic wastes of different content to the mechanical properties were investigated. The composition and microstructure of AAC were characterized by X ray diffraction（XRD） and scanning electron microscope（SEM）. The results indicate that the high aluminum AAC specimens in which 40%（by mass） quartz sands were replaced by ceramic wastes have better performance than the specimens without ceramic wastes. The existence of ceramic wastes promotes the crystallization of hydration products, improves the compactness and enhances the mechanical performance.