KMS (Knowledge Management System) is used by various organizations to share information. This KMS includes imp ortant information as well as basic information used by each organization. To protect infortant information stored in KMS, many KMS use user identification and authentication features. In such a KMS security environment, if the account inform ation of a user who can access the KMS is leaked, a malicious attacker using the account information can access the KM S and access all authorized important information. In this study, we propose KMS with user access control function that c an protect important information even if user account information is leaked. The KMS with the user access control functio n proposed in this study protects the stored files in the KMS by applying an encryption algorithm. Users can access impo rtant documents by using tokens after logging in. A malicious attacker without a Token cannot access important files. As a result of checking the unit function for the target user access control function for effectiveness verification, it was confir med that the access control function to be provided by KMS is normally provided.