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The inclined six-roll tube straightener is an important equipment for the finishing line. It can not only straighten the steel pipe, but also finish the ovality of the cross section. In the actual straightening process, the cross section of the tube is prone to deform, that is, the roundness is not good. The flattening displacement is an important parameter to control cross-section forming of tube. According to the established mechanical model, the analytical calculation equations of the flattening force and the flattening displacement were derived using the energy method. Based on the finite element simulation data, the ratios of the finite element results of the flattening force to the analytical ones were fitted. The correlation coefficient after fitting is greater than 99％, and the fitting effect is excellent. The flattening experiment was carried out on tubes of different materials and different specifications, and the setting method of the optimal flattening displacement during straightening process was obtained. In the actual straightening process, using this flattening displacement, the ovality of straightened steel tube is less than 0.3％. Therefore, the proposed method can provide a reference for the flattening displacement in the actual straightening process.