The urban heritage is one of the significant features of any the city's architectural personality; it represents the ancient's cleverness of dealing with their context through the generations. On the other hand, Green Architecture is on of the architectural concepts that emerged after the energy crisis in the seventies of the 20th century; when some architects developed designs, which was interested in environmental impact of the building through the building existence. The paper aims at studying urban heritage through the scope of green architecture. To achieve the paper aim we need to know more about the green architecture, which has been done in the first part of the paper. The second part is a studying of the urban heritage of Old City of Sana'a -as an example-. The last part is an evaluation of the urban heritage of Old City of Sana'a from the scope of green architecture. Finally, the research conclude that the urban heritage in old Sana'a city has most of the green architecture concepts