Many organizations have implemented knowledge management which has emerged as an issue that managers have to deal with. . In order to evaluate the difference among organizations' knowledge management practices, it is necessary to construct a knowledge management maturity model. Based on the concept of continuous process improvement and the capability maturity model (CMM) of the Software Engineering Institute (SEI), in this paper, a new knowledge management maturity model is constructed, which can be used to describe how organizations support the practices at each maturity level, and provide maturity paths that organizations can follow. A commercial bank will be taken as an example to illustrate the application of this model and discuss how to support the practices at each maturity level in a certain organization by using this model