  Supernova remnants (SNRs) are believed to be the most important acceleration
sites for cosmic rays (CRs) below $\sim10^{15}$ eV in the Galaxy. High energy
photons, either directly from the shocks of the SNRs or indirectly from the
interaction between SNRs and the nearby clouds, are crucial probes for the CR
acceleration. Big progresses on observations of SNRs have been achieved by
space- and ground-based $\gamma$-ray facilities. However, whether $\gamma$-rays
come from accelerated hadrons or not, as well as their connection with the CRs
observed at Earth, remains in debate. Large High Altitude Air Shower
Observatory (LHAASO), the next generation experiment, is designed to survey the
northern part of the very high energy $\gamma$-ray sky from $\sim 0.3$ TeV to
PeV with the sensitivity of $\lesssim1\%$ of the Crab nebula flux. In this
paper, we indicate that LHAASO will be dedicated to enlarging the $\gamma$-ray
SNR samples and improving the spectral and morphological measurements. These
measurements, especially at energies above 30 TeV, will be important for us to
finally understand the CR acceleration in SNRs.
