This paper examine the impact of capital structure on firm performance, in Indonesian Stock Exchange. Firm performance are analyzed from the side of accounting indicators, in this research use liquidity. Because the optimal level of debt of the firm is limited by the liquidity of the assets and it depends on the average USAge of the debt in the particular industry. In the other side liquidity is conventionally seen as reflecting investors\u27 degree of risk -aversion, The study collects of listed firms in Indonesian Stock Exchanges during 2011 to 2012. The listed firms on sub sector trade, services and investment. Multiple Regression analysis approach was employed in carrying out this analysis. Specifically, determined the simultaneous relationships among the various variables. The results show that as partial total debt to asset significantly influences to company\u27s performance but long term debt to asset not significantly influences to company\u27s performance. Simultaneously, total debt to asset and long term debt to asset influences company\u27s performance. This evidence is consistent with models of optimal capital structure and with the hypothesis that debt level changes release information about changes in firm value/performance