Abstract: The light output as a function of electron and proton energy for SND-S1 liquid scintillator was measured using several γ-ray sources and mono-energy neutrons from D-D, D-T nuclear reactions. The electron energy spectra of ¹³⁷Cs (resolution-free) was calculated by Monte-Carlo code Penelope. It is found that the difference of the maximum Compton electron energy between calculated and measured values is 2.7%.The experiment results were compared with those of literatures. For energy below 3 MeV, results are in excellent agreement with all literatures’; Above 6 MeV, in excellent agreement with one literature’s and in moderate agreement with others’. The results indicate that the increase of the light output of liquid scintillator linearly depends on the energy of electron, but nonlinearly on the energy of proton.