大型医疗设备如ＣＴ、核磁共振、直线加速器等已经越来越广泛地应用于临床诊断、治疗。根据维修过程中已经出现及可能出现的失误，笔者提出了几点维修基本原则，介绍如下。１．维修时，不得配戴金银首饰或手表，不得披长发。大型设备线路板、元件密度高。维修中，有时需要在通 Large-scale medical equipment such as CT, nuclear magnetic resonance, linear accelerators, etc. have been increasingly used in clinical diagnosis and treatment. According to the mistakes that have appeared and may occur during the maintenance process, the author proposes several basic maintenance principles, which are described below. 1. When repairing, don’t wear gold and silver jewellery or watches and do not wear long hair. Large equipment circuit boards and components have high density. In maintenance, it is sometimes necessary to pass