Abstract: Zhaojiazhuang Gold Deposit is located in the south of West Qinling,which is a newly discovered gold deposit in this area in recent years.Gold mineralization in the district mainly occurs in slightly metamorphosed clastic rocks of the Sanhekou Group.The distribution,morphology and output of gold ore bodies are controlled by the NEE-trending F5 fault and the secondary structure of its hanging wall and footwall.The gold ore bodies are mainly stratiform and lenticular in shape which strikes NEE-trending,with dips of 350°-20°,dip angles of 50°-70°,length of 68-200 m,thickness of 1.03-5.94 m and Au mean grade of 3.04-8.04 g/t.The type of ores is mainly tectonic altered rock type.Pyrite is the main gold-bearing mineral,followed by sphalerite and chalcopyrite.Gold in ores mainly exists in the form of natural gold,and visible gold is included in gangue minerals or embedded in metallic mineral crystal gaps and cracks,while invisible gold existed in gold-bearing minerals in the form of Au0.According to the comprehensive data analysis,the Devonian Sanhekou Group and the underlying Sinian Bikou Group with high gold background value are the source beds of the Zhaojiazhuang Gold Deposit;metamorphic fluids of early Jurassi from the background of collisional orogeny,which rose and continuously extracted the metallogenic materials in the strata,enriched the mineralization in Sanhekou Group;the weak structural section of Indosinian magma intrusion also provides part of the space for the migration and accumulation of ore-forming fluids;due to the difference in physical properties between the vein rock and the stratum,the later collisional orogenic process is easy to form a ductile deformation zone near the contact surface,which provides favorable space for the circulation and accumulation of ore-forming fluids and gold mineralization.