Abstract: This study provides empirical evidence on the economic benefits of enterprise resource planning(ERP)systems. When the users adopt ERP in the first three years, their performance is better than that of the users without this system. While the control group's total assets have not changed, the users'total assets have increased. The users'balance sheet ratio remains unchanged,while that of the control group has increased. Therefore, ERP indirectly enhances the users'efficiency in the use of funds. Within two years, the users'inventory turnover and accounts payable turnover with the ERP systems has dropped. But it take a long time to for ERP systems to play a key role in users'operation.