The paper uses the adjusted three-stage DEA model to take a research on X-efficiency and cost efficiency of Chinese commercial banks to eliminate the effects of random errors and external environmental factors on X-efficiency. then we take their average as Xefficiency at the third stage. Conclusions are following:thc X-efficiency at the third stage under the CRS hypothesis is more convincing; the efficiency values in the third stage is more real than that in the first stage; accession to the WTO with opening up the financial industry and the firms share reform have greatly positive effects on the X-efficiency, rather than the original expectations that opening up the financial industry will diminish the efficiency of financial sector; "the shortest plate " of commercial banks in China is deficient in costefficiency when firms operate.
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