WTO/DDA agricultural negotiations in progressing will give more effects on Korean agriculture in domestic subsidies and Tariff reduction than those of UR negotiations on agriculture. This paper is aimed to establish forecasting and strategic simulation model and particularly analyze DDA impacts on major flavor vegetables(garlic, pepper, onion) in terms of Developing Country Status and Developed Country Status, and thus provide effective strategies coping with the international changes. The purpose of this study is presenting future economic indexes in detail such as production, consumption, import & export, income by five scenarios based on the Chairman's first draft of modality for agricultural negotiation.