Abstract: According to the tungsten grade of 11 middle segments from the Shirenzhang tungsten deposit,the average value,standard deviation,coefficient of variation and average mineralization intensity of tungsten grade are calculated in each middle segment.During studying on the fractal dimension of tungsten grade in the vertical variation,it was found that the 598~410 m middle segment is the mineralization center of Shirenzhang deposit.The fractal dimension characteristic of tungsten grade can divide mineralization stage effectively,indicating that the tungsten deposits experienced a superposition of three major mineralization events,which occurred mainly in wolframite-sulphide-quartz stage and cassiterite-wolframite-quartz stage,and the former is stronger than the latter.Although the D fractal dimensions are minimal in the 380~340 m middle segment,there are still a lot of bonanzas containing wolfram,which shows the prospecting potential in the deep section.