Abstract: Comparing the advantages and disadvantages of the borehole-bottom detonating with the collar detonating, this paper describes the superiorities of the borehole-bottom detonating in the mid-depth borehole blasting; particularly introduces a kind of the composite tubular borehole-bottom detonatingcharges applying to the mid-depth borehole phneumatic charging and can be made by mine oneself;outlines the anti-electrostatic and anti-percussion tests for safely using the charges, and gives the results of the field electrostatic measurement. All thise present certain reference and application values to the underground mines.