Liberalization is an undeniable trend these days which countries can not evade that. It will effect on all aspects of economics in the world. One of the most important parts of one economic which will be impressed by liberalization and WTOs rules is import. In liberalization process, tariffs reform and it may change the direction of trade between countries. All countries should think about WTO rules deeply, exactly about import and export and more over about their affects on GDP which is important to public welfare enhancement. In this study, for exploring the impacts of liberalization on import of Iran -one of the developing countries which are not the member of WTO- the import function of agricultural sector was estimated with regarding an important index which show how much an economic is open. This index is the Integration of International Trade (IIT). The span of our study is 1970-2006. At the end of article some suggestions and strategies have been presented

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