Abstract: Two typical gold deposits, Paishanlou（with a reserve of 12 tons and a grade of 2.5 g/t） and Baizhangzi（with a reserve of 15 tons and a grade of 4.2 g/t）, are developed in the Western Liaoning Region. They occur in the contact zone between pre Cambrian metamorphic rocks and Mesozoic granite and are controlled by deep faults. C—H—O—S—Pb isotope and rare earth element analysis indicate that the ore-forming fluid is mainly composed of magma water（δD=−82.2‰-−72‰, δ¹⁸O=+4.4‰-+6.5‰）, and the sulfur isotope δ³⁴S value（+5.8‰-+12.6‰） and lead isotope parameters（μ=9.50-9.64） reveal that the ore-forming materials have crustal mantle mixed source characteristics. The ore-forming fluid of the Paishanlou deposit undergoes phase separation at 300-200 ℃ and undergoes water rock reactions along the fault zone to form a hydrothermal alteration type ore body. The Baizhangzi deposit forms vein like mineralization by filling structural fractures with medium temperature rock fluid（200-250 ℃）. The mineralization mechanisms of both deposits are controlled by the coupling effect of Mesozoic magmatic activity and tectonic fracture zones, but the sulfur source of Paishanlou is biased towards metamorphic surrounding rocks（δ³⁴S=+9.2‰-+12.6‰）, while Baizhangzi is richer in magmatic sulfur（δ³⁴S=+3.5‰-+7.0‰）. This mineralization model has a similar tectonic magmatic background to the gold deposits in the Jiaodong Peninsula, providing new evidence for the exploration of gold deposits in the western margin of the North China Craton.