It has been proposed a technique for selecting EAS from ultrahigh energy γ-rays against the background of protons with imaging Cherenkov telescopes. This technique has been developed within the framework of «Pamir- XXI» project but it may be useful for other mountain projects as well as for EAS method in general. The specific variant of optical detector configuration for EAS Cherenkov light measurement and the methods of processing of the data and attainable uncertainties of the selection of γ-rays against the background of protons. The EAS from protons and γ-quanta of energy E≥30ТeV are considered.
$^1$Department of Space Physics, Faculty of Physics, M.V.Lomonosov Moscow State University.\
$^2$Umarov Physical-Technical Institute of Academy of Sciences of Tajikistan\
$^3$M.V.Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics (SINP MSU)
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