In Kongjiashan mine field, because of uncertain coal thickness and pulverized coal mainly, and also because of inadequate technical preparing, coal seam conditions were judged inaccurately. By the analysis on the problem reason, selection of mining tool and exploring of mining technologies, φ75mm double tube single swivel mining tube was introduced and a simple mining technology was determined. The application showed that the tool and the technology selected could greatly improve the coal sampling rate to avoid the inaccurate judgment of coal seam.