Access Control need manage all staff to access or modify the permissions of a particular software configuration object, such as software development manager usually has higher permissions than the software developers. Software developers can Remove the configuration items to the corresponding items from the library ,also can modify and check into the software configuration library, escalate the configuration library version; the software development manager, in addition to have all of the developers executive permission, but also can determine the redundant configuration items, and delete the redundant configuration items.