The fracture failure causes and mechanisms of high manganese steel balance blocks casting were studied by analyzing the microstructure, composition, hardness and fracture morphology, and improve the quality of high manganese steel counterweight direction are discussed in this paper. The results show that the chemical composition and surface hardness of the cracked balance block are normal, the core hardness is abnormally large and the microstructure is coarse, the failure form is the mixed fracture mechanism of toughness and brittleness, and obvious shrinkage loose and manganese rich microstructure segregation are observed in the fracture surface. Reduce the cooling rate and harmful oxide content, no riveting cracking of the balance block