Vocabulary is an important element of language proficiency, and acquisition of an extensive vocabulary should be a goal for every language learner (Nation, 2008). As language teachers, it is important that we incorporate a focus on vocabulary into language courses, but in order to do so it is helpful to have some knowledge of students’ current vocabulary level (Beglar, 2010). The vocabulary size test (VST) was developed by Nations and Beglar (2007) to measure the vocabulary size of the students. It is meant to test vocabulary proficiency rather than specific diagnostic of levels at which students may have a lack of vocabulary. This paper presents how to identify the vocabulary sizes of non-English specialization students’ English Vocabulary in Meiktila University, 2019-2020 Academic Year. According to the results, the highest vocabulary obtained by a student is 6,200 and the lowest one is 2,200. The result shows that Day students have much more vocabulary than UDE students
