Abstract: The displacement pressure curve of the valve core bushing of turbocharger is an important basis for the quality determination of the pressure, the pressure curve of the existing pressing equipment is drawn directly from the collected data without processing, however, due to the dual influence of nonlinear friction and the elasticity of the pressure drive chain, the pressing process is prone to nonlinear vibration, which brings difficulties to product quality monitoring and leads to false scrap, thus resulting in higher production costs. This paper introduces the basic structure principle of bushing compressor of automobile turbocharger, and analyzes the pressure vibration curve collected in the field during the pressing process. The dynamic modeling of the bushing pressing process is further carried out, the theoretical mechanism causing the vibration of the pressing process is analyzed, and the measures to suppress the vibration are given, according to the standard of pressure fitting, the least square curve fitting method is used to process the displacement pressure data collected by the equipment, the results of simulation and off-line test show that the proposed method is effective in improving the smoothness of the pressure curve and the accuracy of the quality determination.