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Using Haskel theory, in this paper the main factors of change in wage ratios of agricultural and non-agricultural labor force are explored. Theoretically, the wage gap between these two sectors is explained by the gap between price and the one between TFP of these two sectors. In recent years, the wage gap between the two sectors has been decreasing in Iran. The international trade model (Haskel model) has been used in this paper and the results reveal that the major factor contributing to wage gap is the price one. The TFP is considered insignificant for wage gap. Mainly, the reason for increasing agricultural product index price, compared to that of non-agricultural index price has been government protection of agricultural products during these years.