We made survey observations of the Orion region in the [CII] 158μm line with a dedicated system called BICE (Balloon-borne Infrared Carbon Explorer). Our observed area was apptoximately 12°×8° and a few hundred times wider than previously observed areas, except for COBE observation. Observational results show large-scale [CII] 185μm line emission in the Orion region. The Intensity ratios [CII] / FIR and CO / FIR varies from place to place, which suggests the [CII] 158μm line was emitted in various phases interstellar gas.