  The simulation of the Cherenkov light lateral distribution function (LDF) in
Extensive Air Showers (EAS) was perfomed with the CORSIKA code in the energy
range 10^13-10^16 eV for configuration of the Tunka-25 EAS array. On the basis
of this simulation we obtained sets of approximating functions for primary
protons, iron nuclei and gamma-quanta for zenith angles Theta<=20. The
comparison of the calculated Cherenkov light LDF with that measured with the
Tunka-25 array has shown an opportunity of primary particle identification and
definition of its energy around the "knee".
