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To carry out accurate buup calculations for a pebble-bed fluoride-salt-cooled high-temperature reactor, the energy-dependent cross-sectional model based on the Doppler broadening rejection correction method has been proposed to develop the energy-dependent elastic scatter-ing cross-sectional model. In this study, the Monte Carlo continuous energy code PSG2/Serpent was used to exam-ine the difference between the constant cross-sectional model and the energy-dependent cross-sectional model during buup. For the cases analyzed in this study, numerical simulations show that the multiplication coeffi-cient was improved by hundreds pcm and 239Pu concen-tration was improved by approximately 1-2% during buup when the energy-dependent elastic scattering cross-sectional model is considered.