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On the basis of vertical magnetic gradient data in Liaoning��the underground anomalies were pro- cessed and interpreted by using Euler deconvolution inversion method�� The forward research proves that the magnet- ic gradient calculated by the total field has a higher sensitivity than the measured magnetic anomaly�� Combined with magnetic gradient and Euler method��the authors interpret some complicated structures�� By the contrast of calculat- ed gradient anomaly and measured vertical magnetic gradient anomaly��the latter is higher in resolution�� With the ground magnetic gradient inversion��the results indicate that this method can exactly determine the boundary and depth of underground sewage pipe��