This article studies on the efficiency of multi-word units recognized as lexical bundles in the production of fluent academic writing by EFL learners. The paper begins by presenting the importance of acquiring chunks of words in the production of fluent first and second languages. The paper presents some definitions of lexical bundles, with elaboration on their functional types and roles; it also shows their effectiveness in the production of more native-like academic written discourse. The paper illustrates on some selected methods of instruction, and their effectiveness in the acquisition of lexical bundles and the enhancement of academic writing. It also highlights some important studies, which have investigated different means of teaching lexical bundles targeted for improving the writing production. Based on the results of these studies and the reviewed topics in this paper, it has been found that the acquisition of lexical bundles can be considered a perquisite of the production of fluent academic writing.