Chitosan derivative with glycyrrhetinic acid(GA),which was accumulated specifically in liver,was synthesized.By ion-crosslinking of TPP in GA-CTS solution,GA-CTS-TPP complex nanoparticles were obtained.The physicochemical properties of these nanoparticles were investigated by using TEM and DLS.The experiment in vitro BSA entrapped was studied.GA-CTS-TPP nanoparticles are well dispersed and stable in aqueous solution in 14 months.