This paper is intended to review A Must for College Students, an English learners' dictionary published by East China Normal University Press in May,2013 from the angles of English lexicology,semantics and corpus linguistics.Meanwhile,a comparison is made with some world-famous dictionaries.The results demonstrate that A Must for College Students, whose rich content is substantial,whose practicality is admirable,whose examples are real,whose compiling features are distinct and whose academic quality is first rate in its own way,is really a must for college students.