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In the present study we try to examine the exchange rate changes and financial flexibility as the economic stable indexes on the financial leverage use in the companies so the main issue in this study is to define the financial leverage relation with exchange rate changes and financial flexibility. That is why 88 companies of the companies listed in Tehran stock exchange in 2005–2011. The study type is descriptive–correlative and the multivariable linear regression was used to analyze the data. The findings from the hypotheses test state there is a significant relation between financial leverage and financial flexibility while there isn't relationbetween financial leverage and exchange rate changes.