The effect of indium ion concentration, current density and continuous electrolysis time on the purity and size of the powder by electrolysis process was studied. The results show that：Continuous electrolysis time is longer, the larger sizes of the powder were obtained when the electric parameters are: NaCl concentration is 80g/L, polar distance is 5 cm, thiourea concentration is 0.3 g/L, gelatin concentration is 0.5 g/l, pH = 2.5, Polyvinyl ketone(PVP) is 0.2 g/L. When the current density is 130 A/m2, the particle size of the powder is the smallest, and the purity is the highest. The effect of In3+ concentration on the particle size is the least, but the influence on the purity is the most. Under the conditions of process parameters above and In3+ concentration of 30 g/L, the current density of 130 A/cm2, electrolytic for 1h, the particle size of less than 100 μm indium powder were obtained, which the particle size of less than 30 μm accounted for 75%.