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A solution to use removable storage medium safely is put forward based on the study about trusted computing theory. This solution manages removable media through C/S model, registers mobile storage media used by user in the server, assigns a unique authorization number to authorize it can be used in trusted region; The client consists of the application and driver, the application is used to authorize mobile storage media and record the transaction log, then send control words to the driver after authentication, and the driver makes the mobile storage media at three states: read-only, disabled and normal. So it can control users use mobile storage media safely, prevent leakage of sensitive data in the network effectively.