Abstract: Combining the calculation of resistance to deformation of rolled piece with the based finite element calculation of elastic deformation of roll system, the model of shape control in rollingsilicon steel thin-gauge strip with Sendzimir 20-high mill was established.By calculating the deformation resistance of the rolled piece based on the preset shape and iteratively calculating the elastic deformation between the roll system under the rolling force of the rolling mill, the influence laws of the support roll gap shape adjustment (ASU) and the taper change of the No.1 intermediate cone roll on the shape of the rolled piece were determined.The adjustment of ASU in the middle of the support roll mainly affects the area of 0.6 m at the center of the width of the rolled piece, and has almost no effect on the area of 0-0.2 m at the edge. The adjustment of ASU at both ends of the support roll has an impact on the edges of the rolled piece, and also on the middle part of the rolled piece. Increasing the taper of the intermediate roll has a significant effect on improving the strip crown at a distance of 0-0.15 m from the edge of the rolled piece. By optimizing the calculation of the ASU of the roll system and the axial shifting amount of the intermediate roll, the average difference of transverse of the same silicon steel thin-gauge strip rolled by Sendzmir 20-high is reduced by more than 25%,and the shape control of the 0.25 mm thickness strip reaches below 8 IU, effectively improving the shape control capability of the Sendzimir 20-high mill for silicon steel thin-gauge strip.