Nowadays the EH4 electromagnetic imaging system is a fairly advanced electromagnetic exploration instrument characterized by wide exploration depth, intuitive production response, portability and high efficiency. This paper firstly introduces the principle of EH4 electromagnetic imaging system, then taking the Fuzhou geothermal area in Jiangxi Province as an example, to illustrate its application to reservoir structure survey. In this paper, the Rapid Relaxed Inversion (RRI) method is used to inverse our getting EH4 data. The inversion result reveals the main features of deep geoelectric sections in this area.