  We report X-ray results of the Chandra observation of Orion Molecular Cloud 2
and 3. A deep exposure of \sim 100 ksec detects \sim 400 X-ray sources in the
field of view of the ACIS array, providing one of the largest X-ray catalogs in
a star forming region. Coherent studies of the source detection, time
variability, and energy spectra are performed. We classify the X-ray sources
into class I, class II, and class III+MS based on the J, H, and K-band colors
of their near infrared counterparts and discuss the X-ray properties
(temperature, absorption, and time variability) along these evolutionary
phases.
