Abstract: This article analyzes the characteristics among whole left ditch-bridge, whole left ditch and half left ditch, compares these three kinds of schemes for leaving a ditch in inner dump from technical and economic aspects. That needs to build a transportation road which connects the eastern end of the first mining area with inner dump, which adopts whole left ditch-bridge measure to shorten the length of haul truck and to reduce transportation costs and the secondary stripping quantity to improve the working efficiency. In conclusion, it advices to use the solution of whole left ditch-bridge from technical and economic angle to make sure Heidaigou Open-pit operate smoothly.