To obtain failure characteristic of jointed rock mass, the propagation mechanism of twin collinear cracks with different angle is simulated by finite element under different consolidated condition. The change laws of stress strength gene, the slipping displacement of middle nodes of faces of crack, shear strain and plastic strain near crack tip is derived under different consolidated condition. It is shown that the consolidation role is the evident and the stress concentration is weakened when the inclination angle of crack is in range of 30°-60°. The corresponding value under consolidated condition is smaller than that under without consolidated condition. The slipping displacement of middle points of crack faces in y direction is mainly. The slipping displacement in y direction decreases and the slipping displacement in x direction increases with the increases of the inclination angle of crack. The compressive effect is bigger than that the shear effect.