Abstract: By prefabricating raw coal samples with cracks of different dip angles, uniaxial mechanical tests are carried out. Based on these, the energy evolution characteristics of the bearing failure process are analyzed. It is found that the uniaxial compressive limit of the coal decreases gradually with the decrease of the crack inclination, and the modulus of elasticity decreases linearly. And the brittleness of coal containing pre-fabricated crack gradually decreases as the angle of inclination of the fracture decreases, with the reduction of 36.41% at an angle of inclination of 0°. The “N” curve of the dissipation energy ratio R_d of the coal can reflect the precursor information of coal instability. The smaller the crack inclination of the prefabricated crack of coal, the earlier the R_d fluctuates and reaches the minimum value, the more drastic the R_d changes.