Based on life cycle theory, firms have various characteristics in various stages of their life cycle and Since earnings quality and the quality of financial reporting in general are subjects that have attracted much attention and are the center of debate for investors, regulators as well as scholars in the recent years, this heightened attention to the subject of earnings quality is, in part, due to the wave of accounting scandals of the early 2000s so this present essay is mainly aimed at analyzing the effects of company's life cycle on earning quality of companies listed on the Tehran Stock Exchange. To do this study, financial information of 105 companies listed on the Tehran Stock Exchange during 2006 - 2012 (735 firm-years) examined. Given a lack of consensus about the best way to measure earning quality, it measured by two models (the Modified Jones(1995)model and Leuz et al., (2003) model). To test the hypotheses we used panel data analysis and Generalized Least Square (GLS) method. The results of the study indicated that earning quality is not influenced by firm’s life cycle stages. In other words, the earning quality at each stages of the life cycle is not significantly different from each other.

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