chitosan derivative—quaternary ammonium salt of chitosan (HTCC)was obtained by chitosan(CTS)with (3-chloro-2-hydroxypropyl)trimethyl ammonium chloride(CTA). Blend with polyvinyl alcohol(PVA)derivative to obtain quaternary chitosan membrane material(HTCC-PVA). The membrane material was immersed in a concentration of iodine solution prepared in quaternary chitosan film complex with iodine(HTCC-PVA-I2). Its structure was characterized by means of IR, SEM and XRD, etc．The analysis of iodine content shows that the higher mass fraction of HTCC in membrane material the more adsorption of iodine.The antimicrobial test results show that the antibacterial diameters of the HTCC-PVA-I2 membrane against E.coli and Staphylococcus aureus were ( 23?) mm and (28?) mm ,indicating its significant bacteriostasis degree.