  The DArk Matter Particle Explorer (DAMPE) developed in China was designed to
search for evidence of dark matter particles by observing primary cosmic rays
and gamma rays in the energy range from 5 GeV to 10 TeV. Since its launch in
December 2015, a large quantity of data has been recorded. With the data set
acquired during more than a year of operation in space, a precise
time-dependent calibration for the energy measured by the BGO ECAL has been
developed. In this report, the instrumentation and development of the BGO
Electromagnetic Calorimeter (BGO ECAL) are briefly described. The calibration
on orbit, including that of the pedestal, attenuation length, minimum ionizing
particle peak, and dynode ratio, is discussed, and additional details about the
calibration methods and performance in space are presented.
