Abstract: In this paper, the geological characteristics of Songkalsu porphyry copper-gold deposit and the geochemical characteristics of granite porphyry closely related to mineralization are studied. At the same time, combined with the characteristics of regional tectonic evolution, magmatic activity and metallogenic response, the metallogenic specificity of the deposit formation is analyzed. The trace element characteristics show obvious depletion of Sr, Nb, Ti, P and other large ion lithophile elements, and enrichment of Rb, Th, Zr, Hf and other high field strength elements. The characteristics of rare earth elements of K-feldspar granite show that the rare earth distribution mode is “seagull type”, and the δEu is between 0.41 and 0.49, which shows a strong depletion type, suggesting that there is separation and crystallization of plagioclase in the source area. The rare earth elements REE of the granite porphyry samples are 30×10⁻⁶-50.6×10⁻⁶, with a narrow range of variation and a slightly lower content. The distribution patterns of all samples are consistent, and the δEu is 0.80-1.17, indicating that there is no obvious plagioclase separation and crystallization during the evolution of the magma. These characteristics indicate that the Songkalsu K-feldspar granite is formed in the shallow felsic young crust, and the granite porphyry may have originated from the partial melting of the Neoproterozoic newborn crust, but during the formation process, different proportions of mantle-derived components are mixed. This study provides geochemical evidence for understanding the metallogenic mechanism of the Eastern Junggar Area, with a view to providing a theoretical basis for further prospecting and prediction in the area.