Abstract: In order to solve the problem that the inner-dump transport distance increases due to the steep mining is cancelled in the lower end-slope road at the bottom of Haerwusu Surface Mine, the pit-middle bridging technology is adopted to connect the lower transport road at the bottom. According to technical scheme of pit-middle bridging technology, the calculation model of transport distance and transportation cost is established. The pit-middle bridging technology is applied in Haerwusu Surface Mine and its economic benefits are checked. The results show that pit-middle single bridging scheme can save transportation costs by 29.1%, and the pit-middle double bridging scheme can save transportation costs by 23.4%. Therefore pit-middle single bridging technical scheme is recommended.