The Chengkou arc fault in the Daba Mountain is one of the focus areas in the domestic geological research. With the development of unconventional energy exploration work, especially shale gas exploration work, in recent years, a new round of exploration work has been carried out in this area. Because of the close folds and the dense faults, this area is an area with complex surface exploration condition and complex underground geological structure. The authors deployed some points of log, a test line of seismic survey and a test line of WFEM (Wide Field Electromagnetic Method) in this area. Some conclusions have been reached:logging has the characteristics of high resolution and precise measurement, but due to its limited "a peephole view", the signal-to-noise ratio of seismic data is low and hence fails to provide accurate information of lithology and fracture; therefore, in the areas of complex surface exploration condition and complex underground geological structure, it is very difficult to use seismic exploration; nevertheless, WFEM is applicable and effective in complex geological conditions, as shown by an example. WFEM can be used to find the stratigraphic distribution, structure and fracture characteristics; it can provide electrical distribution characteristics and predict the prospect of oil gas, thus laying the foundation for the next step of 3D exploration.