Abstract: To extend the service life and decrease the drifting engineering amount of orepass system in Maogong Iron Mine，the optimized design ideas of orepass transportation system are put forward according to the reserve distribution features in levels in underground mining system of this mine and the flexible application of chute in mining area.The specific implementation plan of orepass transportation system is proposed combined with the main orepass system and the chutes system in mining section.Both the main orepass and the chute in mining section reduce 60 m in height，therefore，the amount of caving engineering in orepass system is decreased.A layout scheme of orepass with 75° of inclination angle could change the direction of ore or rock flowing in the orepass，reduce the damage impact of ore or rock flowing on the orepass wall.It is propitious to prolong the service life of orepass system.

Key words: Underground mining, Orepass transportation, Optimized design, Reserves distribution, Main orepass, Chute in mine section