  The high frequency peaked blazar PKS 2155-304 is one of the brightest and
most intensively studied prototype of BL Lac objects. Gamma-rays from PKS
2155-304 have been detected from the MeV to TeV ranges. We computed a
synchrotron self-Compton (SSC) model, based on the temporal behavior of the
particles distribution, responsible for the high-energy emission. Using the
available simultaneous multiwavelength data, we simulated the overall spectral
energy distribution (SED) and the spectral variability of this source.
