My name is Sofonias Tadesse. And I want to study architectural engineering. So where can I get free scholarship program in architecture??

Scholarships are awarded either by the schools themselves or by organizations.
They are based on scholarship - meaning how well you have done in your undergraduate studies, so there is no answer for you just by asking us.
It will take weeks of work, so start by looking online at each school you might be thinking of attending. Scholarships (or in many cases, loans, with money tight all over the world) will be in the section called Financial Aid.