Polyaspartic acid/chitosan complex (PASP/CS) was synthesized by the reaction of Polyaspartic acid, chitosan, and glutaraldehyde. The graft copolymer (PASP/CS) was characterized by FT-IR. The inhibition corrosion efficiency of the complex was estimated as 83.5%, PASP and only 58.8% when inhibitor concentration was 8 mg/L. PASP/CS is an anodic corrosion inhibitor in Sodium Chloride Solution. The competitive adsorption of chloride ions and PASP/CS in water can form a layer of dense molecular film on the carbon steel surface composite with a non-location effect. PASP/CS combination can effectively inhibit the corrosion in the carbon steel system. The steel surface morphology was analyzed using scanning electron microscopy (SEM) and an adsorption mechanism model is proposed. The high inhibition efficiency of PASP/CS is related to the adsorption of polymer molecules on the steel surface and the formation of a protective film that can successfully inhibit the erosion of corrosive media and prevent the corrosion of carbon steel in the process.