\begin{document}$ 10^{14} $\end{document} eV to \begin{document}$ 10^{18} $\end{document} eV. The hybrid observation will be employed by the LHAASO experiment, in which the lateral and longitudinal distributions of extensive air shower can be observed simultaneously. Thus, many kinds of parameters can be used for primary nuclei identification. In this paper, high purity cosmic ray simulation samples of the light nuclei component are obtained using multi-variable analysis. The apertures of 1/4 LHAASO array for pure proton and mixed proton and helium (H&He) samples are \begin{document}$ 900 \rm\ m^{2}Sr $\end{document} and \begin{document}$ 1800 \rm\ m^{2}Sr $\end{document} , respectively. Prospect of obtaining proton and H&He spectra from 100 TeV to 4 PeV is discussed."> Expected energy spectrum of cosmic ray protons and helium below 4 PeV measured by LHAASO -
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