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The scission point model is improved by considering the excitation-dependent liquid drop model to cal-culate mass distributions for neutron-induced actinide nuclei fission.Excitation energy effects influence the deform-ations of light and heavy fragments.The improved scission point model shows a significant advance with regard to accuracy for calculating pre-neutron-emission mass distributions of neutron-induced typical actinide fission with in-cident-neutron-energies up to 99.5 MeV.The theoretical frame assures that the improved scission point model is suitable for evaluating the fission fragment mass distributions,which will provide guidance for studying fission physics and designing nuclear fission engineering and nuclear transmutation systems.