Abstract: With the rapid development of solid rocket engine technology, the demand for ablative materials under harsh high temperature working environment is more and more urgent. Due to its good high temperature strength, anti-ablation and anti-scour performance, tungsten infiltrated copper materials is widely used as a key structural component of solid rocket motor, which plays a key role in the performance and structural integrity of the engine. Taking tungsten infiltrated copper products for high temperature as the research object, the ground hot test of motor with working time of 40 s was adopted, and the macro-micro progressive analysis was carried out for the crack phenomenon on the surface of the material after the test. The results show that the microstructure of the throat lining is normal. The transgranular fracture is the main fracture mode and intergranular fracture coexists. Improper protection of external structure leads to ablation and perforation of the outer surface of the throat lining, which is the main cause of abnormal ablation. Material failure can be avoided by strengthening assembly protection or structural improvement.