The study of lexical bundles, also known as fixed phrases, chunks, clusters and multi-word expressions, has attracted considerable attention both in linguistics studies and in academic writing. During the last years, the study of lexical bundles has become more prominent. While most of the previous studies have focused on the use of lexical bundles across different registers and a number of disciplines, a few studies have concerned with the use of these word sequences in different sections of research articles. This study extends this line of research by analyzing the frequency and functional features of lexical applied linguistics (AL) and information technology (IT). The instrument used in this study was Antconc 3.5.8., by which four bundles in the and conclusion sections of research articles written by Iranian and native writers in the field of -word lexical bundles were identified with the frequency and range of five for the and the frequency of 10 for (research-oriented, text-oriented, and participant-oriented). the conclusion. In order to analyze the function of lexical bundles, we used the Hyland's functional taxonomy of bundles in academic writing (2008). The taxonomy is divided into three functional categories of lexical bundles with sub-categories same section of information technology. The results, therefore, indicated that both applied linguistics and Information The study showed that 59 lexical bundles were found in the section of applied linguistics and 39 in the same section of information technology. 40 lexical bundles were also found in the conclusion section of applied linguistics and 15 in the technology writers frequently used lexical bundles in the section of research articles.There was, however, a section in both AL and IT, text-oriented bundles were the most-widely used in the conclusion section in both AL and IT. considerable difference between the two disciplines in terms of the bundles in the conclusion section of research articles. Information technology writers employed fewer bundles. Applied linguistics writers also displayed higher proportion of three functional categories of lexical bundles. While research –oriented bundles rank as the largest category in the help writing instructors to emphasize the role of lexical bundles for the students to better understand these word sequences Participant-oriented bundles constituted the smallest proportion, which could be due to their small function in the and conclusion sections. We can conclude that AL writes tend strongly prefer to the lexical bundles, used in the and the conclusion section since they experience more exposure in their academic education.The findings of this study can in move and steps. Key Words: Applied linguistics, information technology, lexical bundles, corpus, frequency, function.