Reading fluency is one of the most important signs of language proficiency both for native and foreign language speakers (Grabe, 2010; Macalister, 2010; Winston, 2010; Hasbrouck, 2008; Rasinski, 2004; Oakley, 2003; Waldman, 1985; Cited in: Sayenko, 2010, Introduction Para 1). This paper is in the area of reading fluency and tries to investigate the relationship between reading rate or speed and reading comprehension. Many studies have shown that increasing the reading rate will improve reading comprehension (e.g.; Quinn and Nation, 1974; Bell, 2001; Chung and Nation, 2006; Iwahori 2008; Macalister, 2010; Chang C-S & Coolege H-W, 2010; Sayenko T, 2011). This paper reviews some findings of the previous researches. Some of the materials as well as measurement scales which have been used in these studies are discussed. Furthermore some issues that are closely related in the study of the link between reading rate and comprehension are briefly explained. The findings suggest that there is a relationship between reading speed and comprehension, and this relation tends to be positive rather than negative. Finally some limitations and suggestions for future studies have been suggested.