The objective of this research is to study the effect on rice tariff reductions under the Asian Economic Community (AEC) based on 2 assumptions. The first assumption is based on a proposal that all Asian countries reduce their rice import duties to zero immediately, and the second is to reduce the duty under the framework of rice tariff reductions in 2015. The instruments being used to analyze the effect are a model of a Social Accounting Matrix, (SAM) together with an analysis of the Trade Creation on tariff reductions by Baldwin and Murray (1977). The outcome of the research shows that rice tariff reductions have enabled Thailand to increase exports to the Asian rice market, although Thailand would have benef ited from the zero rate reduction as in the first assumption. However, the circumstances under the agreement framework for 2015 (the second assumption) showed that rice tariff reductions by each country are not being practiced. Some countries reduce to zero, but others do very little or nothing at all, especially Malaysia and Philippines who are Thailand's main export markets, thus benef itting Thailand's very little. Besides, in comparing the benef its received from reductions under AEC between Thailand and Vietnam, it is found that Vietnam has received the greaterbenefit.