Abstract
Using IRAS data, we have studied the infrared emission character of the star-forming region CMa OB1/R1 complex in detail and compared it with the optical, CO and radio continuum observations. The results show that the emission from this complex consists of a diffuse emission and several discrete sources. The infrared diffuse emission can be explained by two O stars, but the extended HII region may be the combined result of a remnant of an old HII region and those two O stars, which are still on the main sequence. Most of the discrete sources correspond to the emission or reflection nebulae, but a few have no optical counterparts. The latter may be excited by early-type stars just arriving the main sequence and still embedded in dense dust cloud.
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