Abstract: Abstract: Introduced Long Coal Group Bird Mountain Coal Mine ultra-deep vertical well depth of more than 900 meters, static pressure of 9MPa, underground firefighting, sprinkler and water supply and salvage pipeline conventional pressure reducing valves to reduce the pressure, system failure is frequent, affecting the normal production of coal mines, the design proposes a downhole pressure measurement on the well throttling control of the deep-well water supply and decompression of the transformation program to reduce the pressure level of the pipeline and the cost of the valves, the system's reliability, stability enhancement, the failure rate is lowered! , with obvious economic benefits and reference significance.