Abstract: Disclosed is a method for making nanometer ITO powder. In the method, first and second reactants are added to a solvent to provide a clear metal ion solution. The solvent is an alcohol or an organic solvent. The clear metal ion solution is added to a hydrolysis concentration solution at a desired ratio to provide a first solution. The hydrolysis concentration solution contains a sour catalyst and water. An aging step is taken on the first solution and the hydrolysis concentration solution to provide a second solution. A solvothermal step is executed on the second solution to provide multi-ingredient transparent conductive ITO powder in the order of nanometer. The solvothermal step includes the steps of locating the second solution in a solvothermal device and heating the second solution to a solvothermal temperature for a solvothermal reaction.