对国内某地铁工程验收变压器过程中存在的变压器额定容量偏差问题进行分析。根据目前规范中相关理论依据，得到验证变压器容量的方法。将该方法应用于实际案例中，结果表明，该方法能够简单、准确地验证变压器铭牌容量与实际容量之间的关系。“,”Deviation problems concerning transformer rated capacity in the process of a metro project transformer acceptance are analyzed. According to the relevant theoretical basis for the specification, a method to verify the transformer capacity is worked out. The method is applied to actual cases, and results show that this method is simple and accurate to verify the relationship between marked capacity and actual capacity of transformers.