The determination of the length of borehole orifice-pipe for grouting in the excavation face of shaft and drift and its installation method are discussed when slurry-blocking concrete pad or remained slurry-blocking rock plug is used to stop slurry.The length of borehole orifice-pipe is calculated according to the compressive strength of concrete or the cohesive force between borehole orifice-pipe and concrete when slurry-blocking concrete pad,is calculated according to the cohesive strength between borehole orifice-pipe and grout when slurry-blocking rock plug is adopted.Borehole orifice-pipe can be installed using pre-bury or later-bury method.For safe,some steel bars should be welded on the surface of orifice-pipe to increase the friction force when pre-bury method is adopted;borehole orifice-pipe should is fixed with bolts when later-bury method is adopted.