Abstract: The function of α/β discrimination is very useful for analyzing the mixed sample of α and β nuclides by the technology of liquid scintillation counting(LSC). The liquid scintillation counters with the function of α/β discrimination can be classified as Type A or Type B. Type B counters allow the adjustment of discrimination parameter after the sample measurement, which is a great convenience for α/β discrimination. Hidex liquid scintillation counter is one of Type B counters, but no new LSC spectra, including LSC spectra for α radiation and those for β radiation, is given for new discrimination parameter. This paper suggests methods of reconstructing the LSC spectra for any new discrimination parameter with the example of measuring LSC samples of ²³⁷Np or uranium. The reconstructed LSC spectra are in good agreement with those reported in literature.