the purpose of this paper is to introduce and present the definition of dyslexia, as the most common language disorder, and to show, how it relates to second language acquisition. After introducing dyslexia with some definition, I intend to study how other people approach their dyslectic mates. Then dyslexia is studied in what ways it is responsible for the difficulties and errors in second language learning from the point of view of the four main skills: reading, writing, listening and speaking. Last but not least, some strategies will be mentioned to help the second language acquisition of dyslectic people. So my aim is to reveal the number of problems which dyslexic has to face day by day, and suggest some solutions by which they may overcome their difficulties.