Abstract: The excavation mode of dragline should consider the production of raw coal and the length of the working-line.However in the past ten years, the production target of raw coal has been continuously improved in Heidaigou open-pit coal mine and the working-line became longer after it was transferred to the second mining area.As a result, the efficiency of dragline is continuously decreasing and the cost is increasing.At present, it becomes the bottleneck of the comprehensive mining process.In view of the above problems, the influence of the parameters of the working surface on the system excavation efficiency was studied and analyzed.Three types of dragline excavations were proposed, and calculated some crucial parameters, which include the amount of excavable materials, available disposal space, the secondary dumping amount, etc.Under current mining conditions, it concluded that the dragline received the highest efficiency and best economic benefits when it products by standing on the working surface and dumping site.