Geomorphology of Guizhou Province belongs to the plateau mountain area of southern China, where the terrain undulates greatly, regional carbonate rock is widely distributed, there exist towns, roads and other human interferences, and geological structure is complex. Therefore, it is difficult for conventional methods to obtain good exploration results. With the utilization of wide field electromagnetic method in Ziyun area of Guizhou Province, the distribution range and buried depth of the deep shale series were basically determined, and the fault characteristics in this area were detected, which provided the geophysical exploration basis for the drilling arrangement. The results were verified by drilling, and good exploration results were obtained. The case study shows that the wide field electromagnetic method is suitable for exploration in carbonate rock area of complex terrain, and it is an effective method for deep exploration.