English, as a global language, is one of the dominant mediums in great number of areas such as politics, economy, and international education. English is the major tool to communicate with the all people around the world and the main language used for international trade and academic study. That is why people want to learn English as a foreign or second language in their countries especially in Iran. Educational materials in general and textbooks in particular have a crucial role in this process. Moreover, the tangible element that gives a language course face validity to many teachers and learners is the textbook. That is why textbook selection and evaluation appears to be a very important issue in teaching and learning process.