Concrete in the curing process will appear microcracks inside, they are going to grow and be connected to each other to form some obvious cracks due to temperature and load changes during extraction. With the propagation of cracks, sudden destruction can occur to concrete structures. The paper will evaluate the effect of nano silica on the fracture properties and crack extension resistance of high-performance concrete during the complete fracture process. The crack extension resistance of high-performance concrete including nano silica will be calculated based on the softening laws and the results obtained from the three-point bending test of beam samples with a notch according to Rilem’s recommendation. In addition, the initial fracture toughness and unstable fracture toughness will be determined to estimate the crack propagation stability. Mechanic properties such as compressive strength, tensile strength and elastic modulus are also determined to calculations in the model. Finally, the crack extension resistance curves for high-performance concrete are established based on a programming method.