Abstract: The effects of few-layer graphene (FLG) on the fluidity and mechanical properties (compressive strength and flexural strength) of cement paste were systematically studied. The mechanism of the effect of FLG on the mechanical properties of cement paste was analyzed by SEM, XRD and EDS. Meanwhile, the layers and structures of FLG were characterized by AFM, Raman and SEM techniques. The results show that the number of FLG layers is 3-6, showing a hexagonal honeycomb structure with interlayer stacking. The incorporation of FLG can reduce the fluidity of the paste. The 3 days and 28 days compressive strength values of the paste increase by 27.84% and 13.52%, respectively, and the 3 days and 28 days flexural strength values increase by 12.92% and 19.68%, respectively. The template effect of FLG can promote the growth of cement hydration products, change the shape and size of hydration crystals, and make it form a complete and dense trend, and make the paste structure more dense.