The high-density electrical method belongs to the category of the direct current method. It can observe parameters such as apparent resistivity and apparent polarizability and form 2D/3D sections in real time. It has the characteristics of high data density, high observation accuracy, and high construction efficiency. It can be widely used in karst and mining Survey of empty space, archaeology, and civil air defense engineering; basic survey of water conservancy, hydropower, highways, railways, bridges and other metal and non-metal minerals and underground water resources survey; survey of culturally hazardous geological bodies such as landslides, collapses, dike hidden dangers, and soil pollution investigations and other fields .