Abstract: In order to solve the problem of period matching of hypo-peritectic steel casting between BOF and CC, improve production efficiency, the stable production of high casting speed of hypoperitectic steel was realized by optimizing mold cooling, oscillation mode and mold powder. After optimization, the cooling water velocity of mould increased from 7.27 m/s to 8.45 m/s, the negative time of mold oscillation mode was controlled from 0.112-0.128 s to 0.151 s， the basicity of mold powder increased from 1.28 to 1.29, the viscosity of 1 300 ℃ decreased from 0.13 Pa·s to 0.12 Pa·s. The maximum casting speed reached 1.6 m/min，the incidence of longitudinal cracks on the surface of slab was less than 0.3 % and the quality of central segregation was stable.

Key words: hypo-peritectic steel, high speed, slab quality