Abstract: The Q315 gold deposit is a nearly SN upright quartz vein type gold deposit in Xiaoqinling gold ore field, which is the largest gold deposit discovered in recent years. The gold ore bodies are controlled by the north-south-distal tectonic belt. The ore bodies in the northern section (orebodies in IV and I), the central section (orebodies in Ⅱ and Ⅲ) and the southern section (orebodies in V and VI) of the Q315 gold deposit are distributed along the structural belt at even intervals, which vertically present "torch-like" shape. The primary halo study shows that the Au mineralization from shallow to deep is weak→strong→weak. In the depth, the mineralization is stronger in the southern part than that in the north, and the ore bodies of the V and VI have good mineralization potential for in the depth of 500m.