Abstract: It is necessary to ensure that its assembly dimensions are within the effective range after repairing the wear of the finished annular cutter hub. Therefore, researching the impact of different repair processes on dimensional changes has practical significance. This paper compares and studies the effects of three surface treatment processes, namely laser quenching, intermediate frequency quenching, and overall nitriding, on the size of the 42CrMo finished shield tunneling ring cutter hub. The results showed that the outer diameter size of the finished annular cutter hub（20 pieces/group） changed by-0.012～-0.008mm and the inner diameter size changed by-0.013～-0.007mm after laser quenching; The change in outer diameter size after intermediate frequency quenching is-0.180～0.130mm, and the change in inner diameter size is-0.120～0.120 mm; The change in outer diameter size after overall nitriding is-0.015～0.015mm, and the change in inner diameter size is-0.020～0.005mm; The depth of the hardened layer is 0.6mm, 3.5mm, and 0.3mm, respectively. Based on the comprehensive comparative test results, the laser quenching process is optimal process solution has the smallest range of dimensional changes and a moderate depth of the hardened layer.