Through three-point bending fracture test of 18 groups of 90 pre-cut beam specimens of cementitious composite， the effect of polyvinyl alcohol （PVA） fiber and nano-SiO₂ contents on fracture properties of cementitious composite was revealed on condition that PVA fiber and nano-SiO₂ was added alone and by blending. The initial fracture toughness and fracture energy were used to evaluate fracture properties of cementitious composite. The results show that a moderate amount of PVA fiber and nano-SiO₂ incorporation can improve fracture properties of cementitious composite significantly. The initial fracture toughness and fracture energy of the beam specimens of cementitious composite without nano-SiO₂ and cementitious composite containing 2.0% nano-SiO₂ increase first and then decrease with the increase of PVA fiber volume content， and all the fracture parameters reach the maximum in the volume fraction of 1.2% of PVA fiber. When the content of nano-SiO₂ is less than 1.5%， the fracture properties of PVA fiber reinforced cementitious composite improve gradually with the increase of nano-SiO₂ content， however， the fracture properties of PVA fiber reinforced cementitious composite are adversely affected when the content of nano-SiO₂ exceeds 1.5%. With the decrease of quartz sand particle size， the fracture properties of nano-SiO₂ and PVA fiber reinforced cementitious composite decrease gradually.