In order to explore the crack propagation law and fracture mechanism of tension-shear damage for fissure limestone, the tension-shear fracture test was carried using based on fissure limestone, and the corresponding model was also established using ABAQUS. The change of stress cloud diagram of the fracture damage process occurring at the fracture tip under different loading positions was obtained. The stress intensity factors for type I and II were calculated by using J-integral and displacement extrapolation method. The results show that the stress concentration zone is formed directly below the loading point, at the tip of the crack and at the bottom of the protruding area which are connected with each other. The crack propagation path for numerical model basically coincide with physical test. With the increase of loading distance, the crack initiation angle and the farthest spreading distance in horizontal direction become smaller. The values of stress strength factor K_Ⅰ and K_Ⅱ for different loading distances are calculated based on J-integral and displacement extrapolation method. The relative error is less than 5% and the calculation result is accurate. The real fracture situation of the test can be reflected better by the model established in this paper, and an important theoretical basis can be provided by its analysis results for the prevention and control of dangerous rock collapse.