The aims of this research are to explain the grammatical errors found in students’ abstract of manuscript and to explain the causes of grammatical errors made by students in abstract of manuscript. The data were collected by selecting the manuscript then deciding the abstract of students’ manuscript. The writer continued analyzing and finding the grammatical errors of students’ abstract of manuscript. There were 9 manuscripts of 7 Biology education students at Science and Technology Faculty. The results of the analysis show that the writer found 74 errors from the students’ abstract of journals because of omission, addition, misordering and misformation which are 19 omissions, 13 additions, 23 misordering, and 19 misformation. Most of them are errors in misordering and another is misformation. The most common types of errors made by students are misordering with number of errors is 23 or 31.1 %, misformation with the number of errors is 19 0r 25.7 %. The writer used Dulay, Burt and Krashen’s theories to describe the types of error which are omission, addition, misordering, and misformation. In the other hand, the factors of error found in this research such as; translation (43.5%), first language interference (37%), and carelessness (19.5%). Based on findings, some suggestions are proposed to improve the students’ mastery in English especially in writing skill. The students should practice writing started from manuscript abstract. The lecturer should give feedback toward their manuscript abstract and publish their manuscript abstract to be journal. This research can be reference as basic material in grammar for making writing.