dbus server run with root privilege can't request 'DBUS_BUS_SESSION' service?

[zhu minjue]

I have a daemon program.The daemon requests 'DBUS_BUS_SESSION' type dbus
service.If I run it with general privilege, I can see my requested dbus
services in d-feet.But if I run it with root privilege, I can't see the
services in d-feet.Does anyone know why this happen? Can the client
still communicate with by daemon if which run with root privilege?

Michael Zu