Cotton is one of production that its added value is more than hundred percent and itisa strategic and valuable production in all countries. In recent years, cultivating of cotton has decreased very much and its price doesn’t have a considerable growth. Hence, this paper has studied causal relationship among the price, infield and product cost of cotton in Iran’s agriculture through 1996-2012. For causal relationship have been used Granger, Toda and Yamamoto tests. Similarity of the two tests is that based on every two tests causality is confirmed from prices over production cost and unfiled. But in Granger test, causality is from cost over the price. While in causal Toda-Yamamoto test the causality is from infield over production cost and the price.

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