More than one hundred K feldspars were collected from gold-bearing Vein Ⅰ(K feldspar-quartz vein) and Vein Ⅱ (quartz vein) as well as various other rock types in the Wulashan gold deposit, China. Chemical compositionsof K feldspars were analyzed using electron microprobe analysis (EMPA). The powder X-ray diffraction (XRD) patterns of K feldspars were collected using Cu Kα source. Au contents of the corresponding ore samples were analyzed by fire assay. Q- and R-mode cluster analysis and Spearman rank correlation analysis of the experimental data were performed. The results indicate that K feldspars from gold-bearing veins, magmatic hydrothermal veins and altered wall rocks are intermediate to maximum microclines characterized by higher content of K2O, lower contents of Na2O, CaO and BaO, and relatively small variations in chemical compositions. K feldspars from other rock types are likely sanidine, orthoclase or microclines that show greater variations in chemical compositions and are characterized by lower content of K2O but higher contents of Na2O, CaO and BaO. K feldspars from auriferous samples are much richer in K2O, indicating that gold mineralization might have been related to potassic hydrothermal fluids and intense K feldspar metasomatism. There exist two gold mineralization stages in the Wulashan deposit. K feldspars from the major K feldspar_quartz veins are characterizedby higher K2O and higher formation temperatures of 307～379℃ with an averageof 353℃. K feldspars from the quartz veins of the second stage are characterized by lower K2O and lower formation temperatures of 260～318℃ with an averageof 281℃. These results indicate that the mineralization fluids were associatedwith magmatic hydrothermal events and evolved toward lower temperatures and lower content of K2O, but the hydrothermal fluids of higher K2O and the temperatures of 260～380℃ may favor gold mineralization.