In this study , the financial information’s qualitative characteristics was used for evaluating earning quality. Regarding to limitations, we examined 85 firms accepted in Tehran Stock Exchange in 1375-1384 period. At first, dimentions of relevance and reliability of earning for all of sample firms, was estimated by using of Time series and Panel data analysis. Then, the firms with cluster analysis method, was classified, and firms with high and low earning quality was segrageted. Finally, Ohlson’s price-earning regression for test hypotheses was applicated. The result show that earning response coefficient and explanatory power of earnings are significantly higher in portfolios of firms with high quality earnings compared to firms with low quality earnings. Therefore, all of hypotheses was accepted. In this study was shown that, the earning quality reflects decision usefulness to investors.
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