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The calculation method of the inner diameter shrinkage of the copper sleeve is not introduced in the general mechanical manual, and the copper sleeve is inserted into the hole seat, which is often encountered in the decoration work. Since the copper sleeve and the hole seat generally adopt an interference fit, the copper sleeve is pressed in. After the hole seat, the inner hole will shrink. In order to make the copper sleeve and the shaft still have clearance fit after assembly, the machining allowance is usually reserved by using the inner hole of the copper sleeve, and the method of boring or scraping the inner hole of the copper sleeve after being inserted into the hole seat is satisfied to meet the use requirements. This processing takes time and effort and needs improvement. After a long period of exploration, we found a way to calculate the shrinkage of the inner diameter of the copper sleeve.