Abstract
The construction and promotion of the Asian Highway in the Mekong Subregion countries will make a part of lower price cargo by ship convert to by land. In this paper, the increase of gross regional domestic products (GRDP) and the minus benefit of carbon emission in this case are estimated with spatial econometrics model (SAR model). The route that can increase GRDP most is Vietnam – Thailand. GRDP is increased not only in the regions along route but also in neighboring regions on each route. The minus benefit of carbon emission is quite smaller on each route.