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Two kinds of indium-tin oxide (TO) precursors, cubic indium hydroxide (In(OH)3) and orthorhombic indium oxide hydroxide (InOOH), were prepared by a co-precipitation method. With the help of X-ray diffraction (XRD), thermogravimetric analysis (TGA) and differential thermal analysis (DTA), phase evolutions from cubic In(OH)3 and orthorhombic InOOH to cubic ITO solid solution and rhombohedral ITO solid solution by heat-treatment had been comprehensively investigated. The transformation from cubic In(OH)3 to cubic ITO solid solution started as low as 150℃ and ended at about 300℃, and it exhibited an endothermic behavior. The transformation from orthorhombic InOOH to rhombohedral ITO solid solution started at 220℃ and ended at about 430℃. Moreover, this transformation was composed of two processes:the one was the dehydration of InOOH exhibiting an endothermic behavior and the other was the transformation from dehydration products to rhombohedral ITO solid solution exhibiting a strong exothermic behavior. Rhombohedral ITO solid solution was metastable in air and it would transform to cubic ITO solid solution by heat-treatment. The transformation from rhombohedral ITO solid solution to cubic ITO solid solution started at 578℃ and ended below 800℃, and it exhibited a weak exothermic behavior.