Achievements in tackling key scientific and technological problems during the seventh five-year plan peried in Fankou Lead-Zinc Mine are presented in the paper, with the emphasis on new developments in large diameter longhole mining technology , combined with multiple-deck spherical cartridges and column cartridges blasting, high intervals level backfill stop-ing, underground on line track weight metering device , movable hydraulic breaker, millisecond blasting system with slide loop for low-energy detonating card and sonic-seismic monitoring technique . Technical performances of the newly designed high air pressure down-the-hole hammer and bits are superior compared with those of imported counterparts. AD these new developments indicate that the increasingly popularized large diameter longhole mining technology has reached a new development stage.