English Proficiency tests, nowadays, popularize around the world which become a global measurement to testEnglish language abilities for non-native English speakers. The implementation of the Common European Framework ofReference (CEFR) not only focuses on language testing but also spreads to teaching and learning. Because of this reason, theMinistry of Education and Training of Viet Nam (MOET) officially adopted CEFR as the national framework of referencefor foreign language education in Vietnam in 2008 under Decision 1400/QĐ-TTG. Although the application of CEFR inProject 2020 promises various opportunities for changing English ability of Vietnamese learners, it still exists manychallenges on learning and teaching factors. Therefore, this paper aims to find out the difficulties of adapting CEFR forEnglish teaching Viet Nam as well as recommend some suggestions to partly solve these difficulties in English teaching andlearning for Vietnamese learners.