In this study, the uniaxial compression test and PFC ^2D numerical simulation were carried out on the artificial rock specimen with T-shaped prefabricated fractures. The effects of the lengths l₁, l₂ of the main fractures, the length l₃ of the secondary fracture, and the angle β between the secondary fracture and the loading direction on the uniaxial compressive strength and crack evolution law of specimen were studied. The research results show that the change of l₁, l₂ and β has obvious effect on the compressive strength and crack growth of the specimen, but the change of l₃ has little effect on the compressive strength of the specimen. When l₃ = 40 mm and l₁ ≠ l₂, the angle β influences on the crack propagation and failure mode of the specimen.