There exist a series of NE-trending strike-slip thrust knob fault belts in the Paleozoic sedimentary rocks west of the NNE-trending Baojing-Tongren fault belt in western Hunan and eastern Guizhou provinces.The fault belts have similar faulting characteristics and kinetic mechanism,are form a large-scale thrust knob structure.The knob structure controlled the distribution of the mercury ore belt in Hunan and Guizhou provinces.The NE-trending fault belt controlled the ore fields in the mercury ore belt,while the secondary extentional-shear fault and fractures derived from the NE-trending fault belt controlled the outcrop and location of individual ore body or deposit.The super-large and large-scale mercury ore deposits occur in the strong stress areas of the knob structure.