two mikrotik

i can use two mikrotik for two different adsl?

Yes,
But i’m not sure about what you’re asking…
Be more specific please

i have two different adsl in two different place so i want use two mikrotik for different authentication. it’s possible?

i’m probably getting annoying, but i still don’t get it… what do you want to authenticate? would you like to connect the two networks through adsl?