Hello,
You can set the password validity period to 0, which means the password is permanently valid. As follows:
Command Line:
<Huawei>system-view
[Huawei] aaa
[Huawei-aaa]local-aaa-user password policy administrator
[Huawei-aaa-lupp-admin]password expire 0
WEB UI:
Enter the Maintenance> User Management > Password Policy, then change the password validity period.
https://support.huawei.com/hedex/hdx.do?docid=EDOC1000163385&id=dc_ar_easyweb_user_0003&lang=en
Any further questions, let us know.