The methods of TMbands ratio and principle component analysis were used to select the characteristic vector that can stress gold alteration mineral information. Based on the characteristic vector, the color composite images were produced. The space filtering and non-supervised classification methods were further used to process the image. There were halo-shaped color abnormal areas in the image. After field verification, some color abnormal areas tally with the geochemical abnormal distribution. In three new-discovered gold ore occurrence, the tenor of gold is 2.74×10^-6 , 9.61×10^-6 and 9.6×10^-6 . According to the color abnormal information in image and the sample analysis result, after analysis of metallogenetic conditions, three gold (silver, copper) mineralization prognostic area were given.