However, the prospect of oil resources exploration and development in Xinjiang is far beyond these achievements, and there are still large-scale reserves lying underground. The piedmont area at the south edge of Junggar Basin is one of the key areas. However, the exploration in this area is very difficult; especially in the piedmont area on the southern margin of Junggar Basin, the gravel layer is widely distributed and deeply buried, and the buried depth of some sections is even more than 1km, which brings great challenges to seismic exploration and other exploration methods. This paper analyzes the application effect of the wide field electromagnetic method in the piedmont area on the south margin of Junggar Basin, expounds the application effect of the electromagnetic method in the exploration of shallow gravel layer and deep concealed structure, and indicates that the electromagnetic method has great potential in oil exploration.