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This study investigates the value-relevance of earnings and book values over time for securities listed on the in Tehran Stock Exchange (TSE). Our work is motivated by recent researches about value-relevance of earnings and book values in equity valuation includings Ohlson [12], and Collins, Maydew and Weiss [4]. Three set of finding are reported. First, the variable earnings have almost explanatory power in equity valuation. Second, combined value-relevance of earnings and book values is through of reported earnings. Finally, incremental value-relevance of reported earnings is higher than book value and book value has very little explanatory power in equity valuation.