Abstract: Systematic comparisons were conducted on core loss test and electro-magnetic core imperfection detector（ELCID） test with practical applications, and analyses were carried out from the aspects of technologies, resources and costs. Research results and practical experience show that, when the stator core does not have severe faults, ELCID test has the similar detective effect with core loss test, while has advantages in convenience and cost. When the stator core has confirmed faults, core loss test should be carried out to thoroughly evaluate the severity of the fault. It is suggested that the fault detection method of generator stator core should be selected through considering the operation of generator. Research results may serve as a beneficial reference for fault detection methods and strategies of stator core in similar large generators.