Through the summarizing of large number of literature on boron steel, there is a brief overview on impact mechanism and application of hardenability, toughness, wear resistance. The hardenability characteristic is gained when B content range from 0.005% to 0.0030%， in order to ensure the hardenability of boron, taking with aluminum and titanium to reduce oxide and fix nitrogen. The factors of content, method of adding and distribution of B, heat treatment and alloying compound action on improving the role of toughness were analyzed. Also the influence of heat treatment and alloying on wear resistance was researched in boron steel. B element in the steel had a broad prospect of application.