Abstract: To study the effect of temperature on the dynamic mechanical properties of marble,dynamic compression tests,XRD,and SEM microscopic tests were conducted on marble samples at room temperature (25 ℃) and after exposure to high temperatures (200 ℃,400 ℃,600 ℃,and 800 ℃).The relationship between the dynamic mechanical properties of marble and temperature,as well as the microscopic damage mechanisms,were explored.The results show that the dynamic compressive stress-strain curves of marble after high-temperature exposure can be divided into 3 stages:elastic,yield,and failure.The peak stress and failure characteristics of marble exhibit a significant temperature effect:as the temperature increases,the peak stress of marble gradually decreases,and the degree of fragmentation intensifies.The dynamic mechanical properties of marble are closely related to its mineral composition and crystal structure.Between 200 ℃ and 600 ℃,micro-defects increase,and dolomite undergoes thermal decomposition and transformation.At 800 ℃,mineral decomposition produces CO2 gas and calcium hydroxide,and the crystal structure undergoes melting damage,leading to severe internal damage and increased plasticity,resulting in a substantial decline in macroscopic mechanical properties.