The influence of GGBS (ground granulated blastfurnace slag) on concrete compressive strength is experimentally investigated in this paper. By bond strength experiment of GGBS concrete with reinforcing steel bar, the influence of GGBS mixture proportioning on bond strength is studied. The result indicates that, with an increase replacement percentage of GGBS, the bond strength between concrete and steel bar will decrease, and the depressed magnitude relates to the dosage of slag powder and type of steel bar. The studies provide a reference for the exploitation and application of GGBS concrete. As known to all, blastfurnace slag is a kind of industry waste produced by blastfurnace puddling. A great deal of research has been conducted on the characteristics of slag powder. The improvements of GGBS on the concrete composites are widely accepted. Studies on GGBS concrete bring remarkable social and economical benefits such as: reducing cost of per cube concrete; improving concrete performance and making full use of industry waste residue. The influence of GGBS mixture proportioning on concrete compressive strength and the bond characteristics between concrete and steel bar is experimentally studied in this paper.