Abstract: In order to provide interpretations with various methods, multi-depth levels and multiple parameters and improve the application effect of airborne electromagnetic method in hydrogeological survey, the authors in this paper established the qualitative or quantitative methods, including studying the transgression level through airborne electromagnetic, water quality mapping and superficial fresh-water exploration, based on the data of Caobeidian area in Hebei, Ding Tomb - Ming Tombs Reservoir in Beijing, Baoqing area in Heilongjiang, Qiaoweila area in Australia and Huanghe River estuary area in Shandong Province. It is proved that airborne electromagnetic method can be used to study the underground water at different depths, the spatial distribution characteristic of transgression and its levels, and can also be used to calculate the degree of underground water mineralization quickly. Especially, the airborne electromagnetic method can provide multi-depth surfaces of transgression and their horizontal boundaries, the distributions of aquifer and aquifuge, and the distributions of water with different qualities, which has shown obvious hydrogeological exploration effect in several study areas.