Taiwan is a nation of small fanning system, and for a long time the agriculture sector has been protected by the government's protective policies such as high customs duties, quotas, and subsidies. After joining WTO, however, our nation must commit to the terms specified by WTO, including lowering duties for imported products, lifting import restrictions, and reducing subsidies which are primarily focused on agricultural products. Taiwan's agricultural products will meet the impacts from cheaper imports in the future, and the authority needs to determine a way to quickly assess the industrial losses within a very short period of time. In this study, we use the Commerce Policy Analysis System (or "COMPAS" for short) developed by the International Trade Commission of the U.S. to assess the industrial losses seen in agricultural products and the impact on the industry if the needed tariff quota policies or SSG (Special Safeguard) for certain agricultural products are lifted. In order to prevent Taiwan's farmers from being affected by massive imported agricultural products, tariff rate quota and SSG on adzuki beans, coconuts, pears, shiitake, dry lily flower are selected as the research subject. We have also collected the related data on this industry and Taiwan's market for further analysis. COMPAS was used to estimate the possible impacts once the protective measures are lifted, and we have determined that once the government lifts the relevant measures, there will be drastic, negative influences on adzuki beans, coconuts, pears, shiitake, dry lily flower price and output, but there are still have positive influence on net economic welfare effect in all. The results of our study serve as references for the 23 tariff rare quotas that Taiwan is practicing, and 15 of them can serve as the references for determining the cost, benefits, and loses of products under SSG, allowing the government to provide needed support and compensations for the possible losses in advance.