Abstract:Segmental height of sublevel caving method of bottomless column directly influences the quantity of mining cutting and the rate of depletion of ore loss, Reasonable segmented height can bring more economic benefits to mining enterprises Reasonable segmented height can bring more economic benefits to mining enterprises. This paper analyzes the influence of rock drilling equipment and mineral body stability on the height of section,It is concluded that the main factor limiting the height of the sub-section of the mine is the stability of the ore body. Reference to similar mines in the country,The influence of mineral stability on the pressure of mining site and rock drilling blasting is also analyzed,Determine the height of the segment to 12m. Production practices indicate, Section height of 12m, High drilling efficiency, High porosity, Blasting is good, Loss and depletion of ore within reasonable limits.