In recent years, secondary vacuum refining technique gets popular and further developed. The heart of global metallurgical industry has transferred from quantitative to be variety diversification and high quality. The super purity index ( total [H]、[N]、[O]、[S]、[P] get 50ppm,or even lower) reflects the quality of product, The effective way to achieve super purity index is secondary vacuum refining technique. There are many ways of secondary vacuum refining, the most popular ways are:1, VD- ladle vacuum refining process.2, VOD- vacuum oxygen decarburization ladle vacuum refining process.