Razuna User Management Tricky Issue

When I add SYSADMIN user to Administrator Group in Raz1, The users will change to Adminstrator Group.
In a situation, if I add all User in Administrator Group, Who can access Site Management. I Mean there is no sysadmin situation.

I can’t really follow what you are saying here.

SysAdmin: Have full access to all hosts/tenants and the backend administration.
Administrators: Have only full access to one host/tenants.

That said, do not add a SysAdmin to another group, for obvious reasons. There was a small bug with this in 1.6.5, it is fixed int he upcoming 1.7.