This factor affect the pronunciation of most Asian adult students in a bad way if the learners have negative attitudes for the English environment .learners or they are introverted students. From my own experience as a student in the UK, I am one of the students who are introverted or shy. Therefore, I usually do not take part in classroom activities; seminars and tutorials .Whereas extrovert students have more chance to improve their pronunciation. Brown (2001) states attitude of the students toward the new language have an effective role in pronunciation learning. Also, if the learners have a good attitude for the target culture, they can develop their pronunciation accurately. If the learners have some prejudices on the second language and its society, this event will influence their approach to the language.It is clear that these above factors are effective in the learners' pronunciation and also exert much influence on the adult learners. So, teachers play a significant role for helping adult learners to develop their English pronunciation. Also, they should pay attention to the students' concern for pronunciation because they are not aware of the way that they speech. Therefore there are lots of methods and types of teaching English pronunciation which help Asian adult students to overcome the difficulties of it. They will also help them to acquire an accurate pronunciation and improve their speech.