Abstract: A new kind of wear resitant steel developed with Si,Mn alloying,which is of structure of Bainite in casting or air cooling state.The structures and properties of the steel was investigated in this paper.The results show that:A high Hardness,high strength,good toughnes can be achieved.The Bainite ferrite is supersaturatad with carbon and of high dense dislocation.There are high carbon content reained Austenites between the ferrites.The wear-resistant parts made by this steel have better wear resistace than traditional high manganese steel and low chromiun white cast iron in industry polication.The reason of good abraisive resistance of this steel was also discussed.