Nowadays, English become an international language that is used widely in all fields of life such as: economy, science, tourism, sports and international conferences. Studying English has become more and more popular to the youth especially to students. It is considered as a necessary language for each student during the process of studying and working, especially, students of foreign language departments. Like any other languages, when using English in communication including both using spoken and written English, we should pay more attention to grammar because without grammar we are not able to write and speak English perfectly. During the process of the learning basic grammar, I myself find it necessary to understand and distinguish the possessive determiners in English and Vietnamese. Hence, with the hope to help English learners understand more deeply about using possessive determiners. The things mentioned above are the reasons why “A study on possessive determiners in English and its equivalents in Vietnamese” is choosen for my graduation paper.