The Jinshan gold deposit hosted in the ductile shear zone is located in the well-known Dexing copper_gold concentration district, northeast Jiangxi Province. K-Ar ages of illite formed during fluid-rock interaction indicate that there existed an obvious Late Paleozoic tectonic hot event in Jinshan district. Baesd on the geological setting, the paper holds that the ore-forming process of the Jinshan gold deposit was related to this tectonic hot event. The ore-forming age of the Jinshan gold deposit is between 269.9 Ma and 317.9 Ma. The paper suggests that there is no direct evidence for the influence of Yanshanian magmatic activity on Jinshan mineralization. It is concluded that there is an obvious Herenian magmatic activity in Northeast Jiangxi or even in whole South China, which seems to be an important gold deposit_forming period.