The main purpose of this thesis is to try to give a proper definition to traditional structure by using the published book and theories of modern civil engineering,particularly from the theories of mechanics to comprehend the traditional buildings,the purpose of the thesis is to try to define our traditional building structure as pole system but not frame work or trestle work after quoting traditional definition.Then,the thesis define traditional structure as a mix system which is composed both with pole and plank basing on the definition