The micromorphology of quartz crystals formed at different ore_forming stages in auriferous quartz veins are studied by means of differential interference microscope. The micromorphologic characteristics of quartz crystal faces of {1011},{0111} and {1010}help to understand the mechanism and the rate of crystal growth, the oversaturation of ore-forming solution, and the variation of the growth environment, and can also provide information for the division of ore_forming stages and the thermodynamic condition for crystal growth.