  The Belle II experiment at KEK in Japan has started real data taking from
April 2018 to probe a New Physics beyond the Standard Model by measuring CP
violation precisely and rare weak decays of heavy quark and lepton. The
experiment is performed at the high luminosity SuperKEKB e^+ e^- collider with
80 x 10^34 cm^-2 s^-1 as an ultimate instantaneous luminosity. In order to
develop and test an appropriate trigger algorithm under much higher luminosity
and beam background environment than previous KEKB collider, a detail
simulation study of the Belle II calorimeter trigger system is very crucial to
operate Belle II Trigger and DAQ system in stable. We report preliminary
results on various trigger logics and their efficiencies using physics and beam
background Monte Carlo events with a Belle II Geant4-based analysis framework
called Basf2.
