Abstract: Based on the non-Archimedian infinite model C²R of the Data Envelopment Analysis,combined with characteristics of Chinese mainland banks' inputs and outputs,the paper sets up an index system of inputs and outputs as well as an overall efficiency evaluation model for Chinese banks,which considers not only the profit ability,but also the control capacity of banks risk.The overall efficiency values of Chinese banks are given respectively based on the samples of state-owned banks and 14 integrated samples both state owned banks and stock banks.The input redundancy of labor,net value fixed assets,operating expenses,owner's equity and output deficiency of operating income,total increase in deposits,total increase in loans,ROE,decrease in bad debts ratio,are also calculated.The contributions and characteristics of the paper are:1) the bad debt ratio is used to reflect the quality of the outputs,which is an improvement to the current literature of neglecting the difference in loans quality;2)the inefficiency reasons of banks are listed out by quantitative analysis,and the pertinent macro strategies and concrete measures on improving banks efficiency are given;3) Combining both state owned banks and stock banks as a whole group of efficiency evaluation shows the real efficiency distance between two different kinds of banks.

Key words: bank efficiency, efficiency evaluation, data envelopment analysis/(DEA), overall efficiency, commercial bank