The Zhangjiakou gold deposit in the northwest of Hebei is a large-size quartz vein type deposit on the northern margin of the North China platform. The present paper deals in detail with characteristics of two major types of ore-bearing quartz (milky quartz and ashy quartz) from this deposit in such aspects as gas-liquid inclusions and their compositional characteristics,micro-deformation, and pomorphic characteristics of the composition and of the cell parameters.In addition, a discussion is made on the relationship between gold content and different typomorphic characteristics of quartz,together with a comparison of typomoiphic characteristics of quartz between this deposit and some other typical gold deposits of the world. The above study shows that ashy quartz is different from milky quartz in such characteristics as gas-liquid inclusions, micro-deformation and trace elements, and that the ore-forming solution of the Zhangjiakou gold deposit must have been a kind of Na+-Ca2+-Cl- type and Na+-Ca2+ -S042- type mesothermal-hypothermal solution with moderate salinity and weak alkalinity.These results combined with the geological setting of the deposit have led the authors to conclude that the Zhangjiakou gold deposit is of metamorphic mesothermal-hypothermal type.