The goal of this study providing emprical evidence of the positive effect of firm size (Size), Capital Adequancy Ratio (CAR), and a Loan to Deposit Ratio (LDR) to prifitability. The sample in this study were taken by purposive sampling as many as 23 banks that is listed on the Indonesia Stock Exchange know 2012-2013. Data analysis was performed Error Correction Models (ECM). The results and significant impact on the profitability of banks. Capital adequancy ratio shows a positive results and significant impact on the profitability of banks. In the short term measurement, the results is also positive and gives significant impact on the profitability of banks. Capital adequancy ratio also shows a positive results and significant impact on the profitability of banks. Loans to deposit ratio shows a positive results and significant impact on the profitability of banks