Abstract: The production flowsheet of austenite stainless steel 0Crl8Ni9 is hot metal dephosphorizing pretreatment- 75 t BOF-VOD-LF-200 mm x 1 200 mm slab casting process. The change of ingredient of 20 t tundish shielding agent (/% : 40.54CaO, 28.89Al₂O₃,7.8SiO₂, 6.32MgO, 1.84C, basicity 5.2) during continuous casting process, and removal effect of oxygen and inclusions in steel are analyzed. The results show that with using high basicity tundish shielding agent after multi-heats continuous-continuous casting the effect of shielding agent absorbing silicate type inclusions is obvious, the average oxygen content in steel decreases from 56. 5 x 10^-6 after LF refining to 37. 5 x 10^-6 in tundish and to 33.3 x 10^-6 in casting slab of stainless steel 0Cr18Ni9； as compared with end LF the amount and size of inclusions in casting slab decrease markedly, and the high basicity tundish shielding agent has an obvious effect on removal of larger inclusions with size more than 20 μm.