Abstract: In general the special steels contain given alloying element, of which the solidification state is different from general carbon steel more easy to produce composition and structure segregation and surface crack of casting billet. Therefore it is necessary to increase cleanliness of liquid steel during special steel steel making, decrease inclusion content and improve inclusion morphology, and using low overheating liquid steel(10～15 ℃)casting and shielding casting technology to prevent liquid steel secondary oxidizing,decrease segregation of composition and structure of casting billet, increase surface quality and internal density of billet. the casting shielding technology, tundish metallurgy, electromagnetic stirring, soft reduction at solidification end, specific mold powder for special steel casting,and automation technique are presented,and the process parameters for special steel casting, existent issue and countermeasure are discussed in this article.