The industry standard of the inspecting instrument for railway track and the national metrological verifica-tion regulation clearly specify that the verification method of alignment and longitudinal level detection units adopts cant repetition,but the conversion of alignment and longitudinal level repetition values and the calculation methods of indication error are not easy to be understanded.The paper provides a detailed analysis of the midpoint chord mea-surement method and trajectory method for verifying the alignment and longitudinal level detection units of the track inspection instrument.The suggestion of optimizing the verification method of alignment and longitudinal level are given:the definition of the alignment and longitudinal level repetition values are unified to the cant repetition value,without the conversion factor related to the physical chord length,and the quantitative traceability of the special block gauges are carried out by the same method;verification points of the track cant,alignment and longitudinal level are uniformly planned and arranged,and the nominal size of special block gauges is optimized;the maximum allowable in-dication error requirements for the values of the alignment and longitudinal level remain unchanged.
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