Research conclusions：The seismic reflection was successfully used for the exploration of coalmine gob in the area with complicated geological terrain condition and in loess area in Linxian along Taiyuan-Zhongwei-Yinchuan Railway Line. During the investigation along the natural ditch, the natural superficial bedrock was used to reach the goal of "dwelling on the solid body and avoiding empty body", and in a specific area, the congested cannon and turnaround cannon were used for increasing the superposed times. For treatment of bend line of seismic reflection, the reasonable selection of CDP range of the plane of common reflection could improve the treatment accuracy remarkably and determine the boundary of coal gob accurately, which could provide the powerful basis for the railway route selection.