Chitosan(CS),(1,4)-2-amino-2-deoxy-β-D-glucan,is the product of partial deacetylation from natural chitin.Recently,much attention has been paid to chitosan because it has excellent properties such as biocompatibility,non-toxicity,bioactivity and physicochemical property.There is a vast vista of application for chitosan in water treatment,chemical industry,textile,food and medicine industry.However,by its crystalline structure,the application is restricted in some respects.It is an effective step to improve the applied properties with the modification of chitosan.The studies on the modification of chitosan and the properties of its derivatives using physical fields(ultrasonic field) for rising the reaction speed and reaction yield.The basic investigative data were provided for the development on the new high efficiency water treatment agent.O-(hydroxyl isopropyl)Chitosan-Fe(Ⅱ) was synthesized via 1,2-epoxypropane derived reaction of Fe2+ with chitosan.The adsorption properties of hydroxypropyl chitosan metal complex(HPCTS-Fe2+) were researched.The structure of the product was identified by Fourier infrared spectrum,UV spectrum and x-ray difffactomer.The adsorptive properties of hydroxypropyl chitosan-Fe(Ⅱ) complex (HPCTS-Fe2+) for heavy metal ions were researched.The experiments showed that the removal efficiencies were 99.8％、78.8％ respectively with using 1％(g/mL) of the HPCTS-Fe2+,pH5,initial concentration 1 mg/L Cu2+ 、0.1 mg/L Pb2+ respectively,absorption for 30min.It showed that HPCTS-Fe2+ might be used as a new high efficiency water treatment agent for absorbing heavy metal ions.