This thesis entitled “ A study of English Pronunciation of Third and Fourth-Year Cambodian Students of Faculty of Humanities Mahachulalongkornrajavidyala university Based on Linguistic Approach” comprises three objectives: 1)Study English pronunciation of the third and four year of Cambodian students from the Faculty of Humanities, Mahachulalongkornrajavidyala; 2) To study the problems of English pronunciation of the third and fourth year Cambodian students of Faculty of Humanities, Mahachulalongkornrajavidyala; 3) To propose the ways of improving English pronunciation of the third and fourth year of Cambodian students of Faculty of Humanities, Mahachulalongkornrajavidyala. This research is a qualitative method. The population and sample of this study were 10 third-year and 10 fourth-year students from Cambodia that were studying at Mahachulalingkornrajavidyala University majoring in English. The data collection in the study was carried out with English pronunciation tests investigating the problems of English pronunciation concerning: consonants, vowels sound, word stress, sentence stress, and intonation for statements and yes/no questions. In addition to these, questionnaire and interview were used in the study. The data collected were analyzed by means of percentage.