Abstract: The effect of two different mineral compositions on the thaumasite formation of cement pastes containing limestone powder was investigated. The samples were cured in 5% MgSO4 solution at 5℃. It was analyzed by appearance erosion change, X-ray diffraction, mortar strength, scanning electron microscopy and energy disperse spectroscopy. The results show that more aluminum phase will lead to form more thaumasite. By optimizing the mineral composition of cement reasonably, the concrete can enhance the ability of resisting the thaumasite form of sulfate attack.