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The main aims of the High-Energy Ray Observatory (HERO) mission are direct measurements of very high energy cosmic ray. Measurements will concern the following scientific goals: detailed study of cosmic rays energy spectra in knee region, search for signatures of dark matter particles. HERO is planned to be launched onboard a heavy satellite. This experiment is based on the application of a wide aperture (>2π) deep (~5λ) ionization calorimeter. The effective geometrical factor of the apparatus is not less than 8-16 m2sr depending on the type of particles. Under the long exposure (~10 years), this mission will make it possible to precisely measure cosmic rays up to 1017eV. Monte-Carlo simulations were performed to obtain instrument response for cosmic ray protons and different nuclei, including helium, carbon and iron.