The study investigates the impact of regional economic integration on Taiwan's economic development and agricultural trade using a computable general equilibrium model-the Global Trade Analysis Project (GTAP) and its new database The simulation results indicates that the trade creation and trade diversion effects by the regional free trade agreements will not necessarily benefit all the member economies, nor the non-members The integration of ASEAN plus 3 will pose a bigger threat to many Asian Pacific countries including Taiwan Both the open or closed APEC will facilitate greater trading relationship among Taiwan and the other APEC members, but a closed APEC will be more beneficial to Taiwan in terms of promoting her agricultural exports.