We dealt with problems, because of inadmissible deviation from the tolerance of thin-walled work pieces in turning. We first measure the cutting forces, which operated on the selected cutting parameters. Under the same conditions, we measure the deformation of the thin-walled work pieces and try to make a connection between them. The experiment is repeat on ten work pieces. With analyzing and measuring, we want to choose the best cutting parameters, which will do the smallest deformation on work pieces. Besides changing the cutting parameters, we can reduce the vibration, change the clamping conditions of the work piece and the conditions of workplace.