Abstract: The electric field of line-charge near a dielectric cylinder is calculated by employing the dielectric image method,and particularly,the expressions of electric potential and the electric field intensity in explicit forms are generated.Further,the equations of both equipotential line and electric field line are obtained.Finally,the maps of equipotential and electric field lines are plotted by mathematical software ＂MATLAB＂ for proving the results.

Key words: dielectric image method, line-charge, dielectric cylinder, electric potential distribution, electric field intensity distribution