The Large High Altitude Air Shower Observatory (LHAASO) is a new generation hybrid cosmic
ray observatory which is expected to reveal the mystery of the origin of cosmic rays. The one
square kilometer array (KM2A) containing 5195 Electromagnetic particle Detectors (ED) and
1188 Muon Detectors (MD) is a sub-array of the LHAASO. The EDs are designed to measure the
density and arriving time of the secondary particles of cosmic rays.
KM2A reaches its 3/4 scale by December 2020. 3978 electromagnetic particle detectors (EDs)
and 917 muon detectors (MDs) are now in stable operation. In this paper, we will introduce the
construction process of ED, the performances and long-term stability of the detectors.