An inversion technique, by using an improved Born inversion and an iterativeprocess in cross borehole structure, is suggested to reconstruct relative permittivity rofiles of cylindrical scatterer. The degraded image resulting from the violation of the Born conditionand the restriction of measured structure is an improved by improved Borninversion and an iterative rocess,respectively. The simulation results show that this inversion technique give betterreconstruction of original rofile distribution than a conventional Bornor an improved Born technique. ulcorner