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Sencitivity in cultural, political, economical and social Inequality led to effort in measuring precition. So, different types of inequality indices are developed and the quality improvement is considered. Due to ever increasing Computer memory capacity and data processing speed, Electronic Cards and trasactions, evolution of information and Microdata phenomenon is emarging. Thus, the main purpose of this study has been to apply Microdata Distribution Expenditure (Income), in order to estimate with more precision the Economic Inequality in Iran and to use the opportunity for testing consistancy among the different inequalty indices in the distribution of income. The results indicate that the average urbanGini coefficient has signaficantly increased during (2000-2001) in compare with (1996-1999), while there has been no differece in the rural areas. According to the results, one may causiosly state that the beginning of the third 5-years develpping plan has started with increase in economic inequality. The down-up inequalty trend in urban areas and the up-down trend of inequality in rural areas during 1996 to 1999 indicate the
lack of any definit and effective policy concerning the income distribution in Iran.
JEL Classification: C14, D31, D63.