Chitosan(CS) and poly(lactic acid)(PLA) were green biomedical materials with potential value for their unique properties including biodegradability

excellent biocompatibility

nonirritant

non-toxic. The advantage of applying separately them to the field of medicine was not significant

but the product of PLA modified CS and its derivatives had can be well consolidated the advantages of both

the better overall performance of the biomedical composite material can be obtained after modification. The property of CS and PLA

the modified reason and situation

application and properties of modified Chitosan in pharmaceutical field were summarized from the perspective of PLA modified CS

focuses on modification of product applications in drug delivery and pointed out the problems and develop tendency of modified materials.