Research conclusions：By comparing the geological conditions of different schemes and combining with topographic conditions，the scheme of excavation along the broad and gentle trough valley of synclinal shaft was chosen to keep away from the instable expansive soil slop and landslide，reduce the route length of passing through the bedding，karst and soft soil region and cut the proportion of tunnels and bridges．Although the total track length increased by 200 m compared with the initial scheme，but the engineering investment and operation risk decreased significantly and the geological conditions was optimal．