  In the framework of Quark-Gluon String Model we calculate the inclusive
spectra of secondaries produced in heavy ion collisions at intermediate (CERN
SPS) and at much higher (RHIC) energies. We demonstrate that the mechanism of
secondary production changed drastically in the energy interval $\sqrt{s} = 20
- 60$ GeV and that is in agreement with qualitative estimates of Glauber-Gribov
theory. The results of numerical calculations at intermediate energies are in
reasonable agreement with the data. At RHIC energies numerically large
inelastic screening corrections should be accounted for in calculations.
