According to my research which is an investigation the viewpoint about choosing third language of RSU 3rd- year English major’s student by questionnaire method. Language, key of humans to develop their skill of Communication. Hence, it is important that people have to learn the language. If you don't obtain another language the world becomes much smaller, in terms of job opportunityand experiences. In addition to English and Thai language. Faculty of liberal arts, there are also other languages which is interesting 5 languages, including Chinese, Japanese, Arabic, Korea and French, therefore this research is to explore the requirement or attention of students to choose one of the five language in order to be their third language.