This paper has discussed the image reconstruction of electric resistivity by Zohdy inversion.Zohdy inversion was advancd on the basis of surface surveying data; numerical modeling and field data inversion proved it to be simple,easy to handle,low in calculation cost,high in resolution and ideal in result. It is hence quite possible to use it in resistivity tomography of field surface surveying. Using Fortran Language, the authors made programming for realizing the aboe process, and used the 2. 5 dimensional finite element method in forward modeling. To improve the image results, they mapped the inversion data ny false color image processing technique.