\begin{document}$ {\cal{O}}(1)\; {\rm{PeV}} $\end{document}, provide a promising opportunity to investigate the ALP-photon oscillation effect. In this study, we utilize the gamma-ray spectra of four Galactic sources measured by the LHAASO, that is, the Crab Nebula, LHAASO J2226+6057, LHAASO J1908+0621, and LHAASO J1825-1326, to explore this effect. We employ the CLs method to set constraints on the ALP parameters. Our analysis of the observations of the four sources reveals that the ALP-photon coupling \begin{document}$ g_{a\gamma} $\end{document} is constrained to be smaller than \begin{document}$ 1.4\times 10^{-10} $\end{document} \begin{document}$ {\rm GeV}^{-1} $\end{document} for an ALP mass of \begin{document}$ \sim 4\times 10^{-7} \; {\rm{eV}} $\end{document} at 95% C.L. Combining the observations of the Crab Nebula from the LHAASO and other experiments, we find that the ALP-photon coupling may be set to approximately \begin{document}$ 7.5\times 10^{-11} $\end{document} \begin{document}$ {\rm GeV}^{-1} $\end{document} for an ALP mass of \begin{document}$ \sim 4 \times 10^{-7}\; {\rm{eV}} $\end{document}, which is similar to the CAST constraint."> Constraints on axion-like particles from the observation of Galactic sources by the LHAASO -
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