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An attempt was made to optimize NOx and particulate emissions from heavy-duty diesel powered vehicles under heavy load engine operating regions by combining EGR and methanol fumigation and the effects on exhaust emissions were experimentally studied. The results under steady states tests show that, the smoke concentration is decreased and total fuel consumption is improved according to the increase in methanol energy ratio. As NOx reduction effect of EGR does not affected by methanol fumigation, drastic NOx reduction can be thereby possible at heavy load regions with the combined use of EGR and methanol fumigation. Then, this method was applied to new Japanese 13 mode test procedure and it was recognized that the NOx mass emissions were reduced to almost one half without increase in particulate emissions. However, drastic increase in CO, HC and aldehyde emissions were observed also.