Chitosan is a fully or partly deacetylated product of chitin.It is well known for its favorable properties such as good biocompatibility, biodegradability, biological activity and non-toxicity.Unfortunately, the application of chitosan suffers greatly from many drawbacks such as insufficient mechanical properties, especially the brittleness, poor solubility and processability, resulting from the strong intramolecular and intermolecular hydrogen bonds between hydroxyl groups and amino groups [1].