Islamic Boarding School is an Indonesian Islamic education institution that has great attention to learning Arabic. To improve student language, this institution teach composition systematically in the Insya’ lessons. However, the Institute continues to face considerable difficulties in learning the Arabic language. Those difficulties appear in the high frequency of errors in the structure of Arabic Sentence. The purpose of this study was to design the Student Worksheet materials based on linguistic error analysis of students in their composition, as an alternative in solving the problems to improve Arabic language skills. The results of the study is that using the linguistic errors analysis to design the Student Worksheet materials is very useful and able to reduce the linguistic errors in the student‘s composition. It was shown by the high posttest result when compared with pretest result.