Youfangxi is a medium size Ag polymetallic deposit in Inner Mongolia. In the deposit occur not only independent silver, lead-zinc-copper ore bodies but also molybdenum ore bodies. The mineralization shows obvious horizontal and vertical zoning. Silver-lead and zinc mineralization spread all over the deposit area and mostly concentrate in the shallow depth. Copper and molybdenum are to depth in the central deposit area. According to the metallogenic geological conditions and mineralization, Youfangxi is potential area for prospecting medium size Mo deposit.