Abstract:The mould flux of TD601 in slab casting of 304 austenitic stainless steel was studied in this text, based on researching the characteristic of solidification of 304 austenitic stainless steel. The mould flux of TD601 has better capability of absorbing impurity and has better stabilization and adaptability. The capability of TD601 mould flux can adapt the technology need of continuous casting. Through testing in the slab continuous casting machine, the grinding ration of slab is reduced and quality of slab is improved.