Background and Aim: HEARING is one of the most vital sensational abilities. Learning, which is the most basic ability for human compatibility to mental development, is affected by HEARING ability. The main goal of this article was to review the effect of HEARING IMPAIRMENT on educational achievement of HEARING-impaired students, especially in the field of basic learning skills (reading, writing, and mathematics).Methods: In this article, the researches on the effect of HEARING IMPAIRMENT on educational achievement were reviewed. There were 37 articles extracted from different databases such as Iran Medex, Scopus, PubMed, Magiran, Iran Journal, Google Scholar, and 12 credible books published from 1944 to 2013. In order to search in these databases, educational achievement and other related keywords were used.Conclusion: HEARING IMPAIRMENT affects listening skills, which is a mental process and is known as the first lingual skill. Subsequently, other lingual skills and learning abilities like educational achievement are affected as well. In order to decrease the educational gap in HEARING-impaired students, it is very important to interfere in early stages and use of presentation methods to improve lingual skills in educational system.