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Database encryption can be used to get rid of the security risk of database systems. Firstly, DES algorithm is used to encrypt the user data, and only the ciphertext of the data is stored in the database. Secondly, the hash value of the string composed of the user name and the user key is used as the user's identification key. Finally, the plaintext or hash value of the user's key is not stored in the database, and the user's key are saved separately by the users themselves. As one-way functions are irreversible and symmetric encryption is difficult to crack, the above methods can effectively prevent external attacks on the database and illegal use of user data by internal authorized personnel.