In this research we investigate the Effect of the corporate governance quality on stock liquidity in accepted companies in Tehran stock exchange. The statistical sample of this research is 60 companies in the period from 2008 to 2013. In this research to measure the corporate governance quality used by 13 factors of that are mechanisms of corporate governance and for stock liquidity used 3 criteria difference between the buying and selling price, number of stock trading, stock trading volume. To analyze this research used by the model linear regression separate with combined data. The results show that corporate governance quality has a significantly positive effect on stock liquidity