In practical work, the relative position between the blind orebody and thetwo power-supply electrodes of the intermediate-gradient facility not distant fromthe orebody frequently makes the blind orebody somewhat under the conditionof non-horizontal uniform polarization. This causes the obtained η_s curve and theconnections of the η_s curve formed by movement of the power-supply electrodesto be distorted to some extent.Through simulating the usually-adopted IPintermediate-gradient facilityand taking volume polarization as an example,the present paper makes an ana-lysis and discussion on the above-mentioned distortion by calculating the inter-mediate-gradient η_s curve and its connections with the formula of point powersource. In addition, it mentions some problems that are worth noticing in proces-sing observed intermediate-gradient η_s data and gives some viewe on IP η_s full-field measurement technique that deserves popularization.