Abstract: Groundwater survey is the premise of reasonable development and utilization of grassland water resources. Hence finding out the aquifer structure is of great importance for groundwater survey.This paper used magnetotelluric method (MT) to identify aquifer structure.The corresponding relationship between electrical properties and strata was interpreted by two-dimensional nonlinear conjugate gradient(NLCG) inversion. The forward and inversion experiments of typical layered aquifer model and local aquifer model were carried out,and the validity of the inversion algorithm for the interpretation of geologic body of low resistivity aquifer was verified.The results provide reference for groundwater survey and a method for similar data inversion.