  The EAS Cherenkov light array Tunka-133, with $\sim$ 3 km$^2$ geometric area,
is taking data since 2009.The array permits a detailed study of energy spectrum
and mass composition of cosmic rays in the energy range from $6\cdot 10^{15}$
to $10^{18}$ eV. We describe the methods of time and amplitude calibration of
the array and the methods of EAS parameters reconstruction. We present the
all-particle energy spectrum, based on 7 seasons of operation.
