Abstract: In this paper, the capability of the rail flaw detection vehicle on the rail head transverse crack detection is analyzed through considering the opplication features in china and the rail head transverse crack detection principles, and is verified by the reference block testing and the in-service line testing. We come to that under the Chinese operation management mode and under the Chinese standard system mode, the rail head transverse cracks detection sensitivity is not lower than that in “Rail Flaw Detection Management Rules”(China Railway Transport Bureau Managing Files ［2006］200).