Abstract: By using GMS-4 infrared brightness temperature and visible albedo data from Jan. to Feb. in 1995, methods of extracting seaice parameters are developed and digital remote sensing pictures are obtained in Liaodong Bay. Based on the difference in physical properties betweenice and water, a criterion disting uishingice from water is set up. Ice thickness has been calculated according to the relationship betweenice thickness and brightness-albedo. Ice concentration is retrieved due to the difference on albedo between ice and water. The results show that a precision of ice-water disting uishing is 84.8%, the error of ice thickness and ice concent ration is 3.8cm and 22%, respectively.