In this thesis, the analysis was executed by using DEA (Data Envelopment Analysis) method. It is noted that banks of Taiwan and mainland China, and the historical data were utilized from 2004 to 2008.We take the number of bank branch office, the number of employees, and interest expenditure, and refer to these factors as the input variables by Intermediation approach. In the same way, we regard interest revenue, loan and discount as the output variables. We estimate the performance of Taiwanese and mainland Chinese Banks individually. The research results indicate Specialized Bank has best performance, because its uniqueness. At first, the performance of Government-owned bank is worse than private bank, but inefficient has been improved by adjusting the scale recently.