This study aims to investigate types of grammatical cohesion employed in English Education Department students’ thesis background and the mostly grammatical cohesion employed in English Education Department students’ thesis background. This report qualitatively conducted as the main analysis to identify the grammatical cohesion such grammatical reference, grammatical conjunction, grammatical ellipsis, and grammatical substitution in 10 students' manuscript.. The findings showed that the most realization of grammatical cohesion was the grammatical conjunction with 274 occurrences, the grammatical reference was 235 times while grammatical ellipsis was 13 times and the lowest one was 6 times; and this could be generally summarized that the paragraphs were structurally unified. In addition to the issue of the further study, the researchers could serve the base of the grammatical cohesion and could conduct the other writings by the use of grammatical cohesion in any level of both written and spoken text.