Abstract: ICP-AES hyphenated with the continuous hydride generation technique was applied to the determination of arsenic,antimony and tin in high-purity indium.Effects of kinds of acid and concentration of acid used for the testing solution,the concentration of sodium borohydride used in the hydride-generation reaction and the use of reducing agents in the pre-reduction process on the intensity of spectral signals were studied thoroughly.Under the optimized conditions,values of detection limit for As,Sb and Sn were found to be 0.13,0.017 and 0.12 μg·g-1 respectively.Recoveries of 108% (for As),93.1%(for Sb) and 91.1% (for Sn) were obtained by the standard addition method.