Abstract: Chitosan biopolymer represents an attractive alternative to other bio materials because of its significant physico–chemical behaviours. In order to improve chitosan’s performance, chemical modification has been carried out. Chemical modification that lead to the formation of chitosan derivatives, grafted chitosan and chitosan composites have gained much attention, extensively studied and widely reported in the literature. In this work, the properties of chitosan are modified by blending with silk fibroin which is another natural polymer which is produced by the silk worm larvae of Bombyx mori. Chitosan/silk fibroin binary blend is synthesized and characterized by FTIR, TGA and XRD. The results showed that the proper blending has been taken place between the polymers.