Fars and Mazandaran provinces because of climatical diversity and climate risk can have comparative advantage in context of agricultural products. In this article, comparative advantage in production some agricultural products, including: barley, grain corn, grain, wheat, beans, and canola and analysis of relations among them, have been identified. In this study, index of Revealed comparative advantage (RCA) for determination comparative advantage of production has been used. Datas are in form of time series and concerning years during2006 to 2010 and are collected through statistical publication of Ministry of Agricultural. Using RCA index showed that Fars province in production agricultural products such as corn, wheat, and beans had comparative product advantage and Mazandaran province in production agricultural products such as grain, and canola had comparative products advantage. So, development and agricultural improvement of cultivation these products will have positive results for national and regional economy.

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