The metallogenic mechanism of Shangshi spodumene- bearing pegmatite deposit, including the source of ore- forming materials and the process of lithium enrichment, remains for further investigation.Methods:In order to clarify the metallogenic mechanism such as the source of ore- forming materials and the process of lithium enrichment, the ore- forming mechanism is discussed based on geochemical characteristics of the major and trace element, Sr—Nd isotope of whole rock, as well as the SQI structure and geochemical characteristics of spodumene.Results: The baishawo two- mica monzogranite exhibits high content of Si2O, K2O and Al2O3, with A/CNK values ranging from 1.20 to 1.32, and relatively low Zr/Hf values (<25) and Nb/Ta values (<5), belongs to strongly peraluminous rocks and show S- type and highly evolved features. The spodumene pegmatites likely formed during the terminal stage of magmatic differentiation, where lithium concentrations reached saturation levels. Notably, the low εNd(t) values (-3.87 to -8.80) and Nd model ages (TDM2 range from 1.41Ga to 1.93Ga) of the baishawo two- mica monzogranite suggests that the rocks were likely sourced from the remelting of the Proterozoic crustal materials in South China. The high FeOT/(FeOT + MgO) ratios (0.85 ~ 0.87), obviously Ba—Sr—Eu negative anomalies, and low Cr and Co contents of the baishawo two- mica monzogranite imply a water- poor and reducing environment during formation. The Baishawo granite likely derived from partial melting of felsic clay- rich crustal sources under such conditions, generating lithium- enriched initial melts. Petrographic textures reveal spodumene—quartz intergrowths (SQI) along the margins of early- crystallized spodumene. The SQI structures potentially formed via petalite decomposition under changing P—T conditions during mineralization. Conclusions: Overlapping processes—partial melting of lithium- rich source rocks and extreme magmatic evolution—contributed to the formation of the Shangshi spodumene pegmatite deposit. Positive correlations between Sn—Ga and Fe—Mn contents in spodumene suggest that rare metals (Sn, Ga) may incorporate into the mineral lattice through Fe/Mn substitutions, while Fe—Al and Al—Si substitutions promote crystal growth and enhance metal enrichment.