The finite element software was used to simulate the tensile failure process of rock bridge with different crack angles based on pre-cracks in the rock bridge. Under the condition of uniaxial compression, the results showed that for two parallel pre-cracks with the same size and distance, the extension level of pre-crack is different and with different crack angles; The bigger the crack angle is, the easier the rock bridge goes to tensile fracture. The "∧" type crack is more stable than that with parallel type .