A study of red granite reveals that the color-forming mineral in red granite is hematite. Hematite mainly occurs in cleavage cracks and microfissures of such mi nerals as feldspar, and the higher the hematite content, the deeper the red color. Based on a brief analysis of the genesis of hematite, the authors hold that hematite in red granite was mostly produced under the condition of high oxygen fu gacity. Hence, this paper has designed a technology for artifically synthesizing hematite, with important technological parameters illustrated. The artificial synthesis of hematite in granite can turn the color of common ligh-colored granite from grey or yellowish pink to red, which is of some significance in raising t he utilization coefficient of common granite.