Ask for help about using of Chinese characters in ldap ldif files

[Steven.He]

hi, there
I am a chinese colleger so I work on a project in which has some
chinese-character-problem to resolve, just like this:
   dn: cn=helin,dc=shaanxi,dc=cn
   objectClass: top
   objectClass: person
   objectClass: inetOrgPerson
   objectClass: qmailUser
   cn: helin
   sn: 贺琳
 mail: [EMAIL PROTECTED]
   accountStatus: active
   mailMessageStore: /vmail/helin/
there is 2 chinese characters in sn attribute, so when I add this ldif
file to ldap-server, it returns ldap_modify: Invalid syntax (21)
additional info: sn: value #0 invalid per syntax. so how to resolve
the problem and thank you very much~
--
贺琳