Did you verify there is an actual trust relationship between the two domains? Also, did you verify these steps from the previous post:
If you added the Domain2 domain account to the LOCAL Administrators group of a PC in Domain1, you do need to reboot the PC in order for those new group memberships to take effect. A domain PC evaluates domain account SIDS in local groups during machine account domain authentication.
If you added the Domain2 domain account to a DOMAIN Security Group that was already a member of the LOCAL Administrators group, it should not be necesary to restart the PC, however, just as with any other domain security group, you'll need to log off and back on to the domain in order to get the proper Group SIDs in your token.
Yes i did . " i added the Domain2 domain account to the LOCAL Administrators group of a PC in Domain1, i's work " tthe trust relationship seems to be ok ....