The one thing that most interferes with English as a Second Language learner’s reading is unknownvocabulary.This refers to any word which blocks the readers’understanding in their process ofreading.When reading,one will inevitably meet unknown vocabulary no matter how large one’smental lexicon is.Often the density of unfamiliar words in reading makes the reader feel greatlyfrustrated and give up in the end,for he has already lost his train of thought when looking up words inthe dictionary.It is clear that too great a density of unknown lexical items slows down the readingspeed which leads to poor comprehension of the text.Of course,one’s knowledge of Englishvocabulary is bound to be limited;but is there a way one can efficiently cope with the unknown wordsone comes across in reading without having to stop and look them up in the dictionary.