Abstract: Kinetics of indium sulfide leaching under different conditions was investigated，in order to improve the leaching rate of indium sulfide fundamentally，by starting with the change law of grain parameter，apparent activation energy and reaction order of conventional acid leaching，potassium permanganate & hydrogen peroxide oxidizing acid leaching of indium sulfide.The results showed that:①The apparent activation energy，reaction order and crystalline parameter of the leaching reaction of indium sulfide were 35.6 kJ/mol，0.770，0.576 respectively under conventional acid leaching conditions，13.9 kJ/mol，0.390，0.366 under potassium permanganate oxidizing acid leaching and 17.5 kJ/mol，0.220，0.466 under hydrogen peroxide oxidizing acid leaching;②Indium leaching rate in conventional acid leaching was more sensitive to changes of leaching temperature and initial concentration of sulfuric acid，while for oxidizing acid leaching，the apparent activation energy and reaction order were significantly reduced，chemical activity significantly enhanced and the reaction rate was accelerated，the sensitivity of temperature and initial concentration of sulfuric acid on the influence of indium leaching was reduced;③The kinetics model of indium sulfide of conventional leaching and oxidation leaching fit Avrami equation well at n＜1.Conventional leaching was controlled by both diffusion and reaction of chemistry，and the oxidation leaching process was controlled by diffusion.Therefore，intensive stir diffusion could increase the indium leaching rate.

Key words: Indium sulfide, Conventional leaching, Oxidation leaching, Kinetics model, Avrami equation