Probability tomography about vertical vein orebody is studied.Firstly,SP supposed to be generated by point curl source which is the border of dipole layer rather than the line dipole layer in section view.then,curl source’s scanning function is given,and image is retrieved by probability tomography approach.Image concerns with the border of vein orebody but not the orebody itself,so orebody can be deduced by accurater distributing of border.Finally,this mend is proved practicable by several theoretic models and one practical model.