Abstract: Under the combined action of mining influence and ground stress, the primary pores and cracks of coal body are further developed and expanded, and energy is the internal factor causing the deformation and failure of coal body.In order to explore the energy dissipation characteristics of coal containing defects in the process of failure, we take the coal with pore-fracture composite defects as the research object, carry out the loading failure test of coal under different loading rates, and analyze the energy dissipation characteristics of the composite defect coal during the loading process.The results show that the pore-crack composite defects will affect the mechanical properties and the deformation and failure characteristics of coal, and the loading rate effect is significant.In the process of coal failure, the pores mainly lead to the concentration of stress in the local area, while the cracks induce the expansion of new cracks.The energy evolution of coal failure mainly goes through three stages: elastic energy accumulation, elastic energy conversion and dissipation energy release.With the increase of loading rate, the coal body enters the dissipation energy release stage earlier.The elastic energy stored in the coal body and the input energy are directly used for coal fracture, which aggravates the damage degree of coal sample.There is a clear correspondence between coal fracture damage and energy evolution, and energy dissipation is the internal factor causing coal deformation and failure.