This paper applied the AIM/CGE [Laos] model to assess impacts of introduction CO2 mitigation actions in the transport sector through the comparison for energy consumption, GDP growth and CO2 emissions in Laos. The introduction of CO2 mitigation actions/countermeasures (CMs) include carbon tax, electric vehicles (EV), biofuels, and subsidy. The model results of BAU scenario show the total final energy consumption will increase in 2050 by 123 %. By introducing EV and biofuels exogenously with carbon tax and subsidy, it is observed that the final energy consumption will reduce gradually in the long-term. GDP will gradually decrease with a loss of 1.9 % by 2050 in case of the countermeasures scenario comprising EV and biofuels plus carbon tax and subsidy policy. The CO2 emission in BAU scenario will increase remarkably at a growth rate of 184 %. EV and biofuel plus carbon tax will result in 57 % decline of CO2 emission in 2050, and the subsidy policy will lead to the greatest fall of CO2 emission. Introduction of carbon tax alone in transport sector will not have any influence on household behavior for energy consumption in both short-term and long-term, resulting in no impact on CO2 emission. Nevertheless, applying mitigation actions (EV and biofuel) plus carbon tax, and subsidy countermeasures can be a significant driver for influencing final energy consumption and CO2 emission reduction. But introducing the mitigation countermeasures, except for carbon tax, will result in a gradual decline of the GDP growth in the long-term.