Acombined scheme of shotcreting and chemical gro.uting is practised in the prevention engineering of large area from leakage and permeation for 800 explosive magazine in Longshan Gold-Antimony Mine. In about 20 days, the treatment project for an area of 700 m2 was completed with the newly-designed Z-7 shotcrete machine, highly effective 782 cement accelerator and SG-2 chemical grout, giving satisfactory results.