This article seeks to examine the effects of the Iran’s accession to the WORLD TRADE ORGANIZATION ((WTO)) on its industry through econometric methods. One of the crucial issue about the (WTO)’s agreement is to assess the post-agreement rates. Removal of nontariff impediments and changing the charges for the custom tariffs of the imported and exported goods will bring about changes in economic structure of Iran. Iran’s industry in terms of the current situation-exclusively for government and also with low productivity in most of the industries is not able to compete with the global industry. If conditions improve, accession to (WTO) will improve industrial products. Based on the data from 1350 to 1385, the results of this article show that, in the case of Iran’s (WTO) membership, if the average of custom tariff rates for the exported goods reduces to 40%, the industrial export increases to 200.2% and if the average tariff rates for the imported goods decrease to 14%, the industrial import increase to 5.6%, and consequently, pure industrial export will increase to 194.6%.