As a scientific work, thesis is not just a formalities requirement that automatically can lead students to finish their education in bachelor level. It must be argued in munaqasyah (thesis examination) that examined by some examiners not only as the test but also as moral and academic responsibilities. It can be as the academical standard or level of the quality of the scholarly works that the students need to fulfil. This study aims the first is to describe the quality of thesis has been made by the students in the Department of Arabic Language and Literature in 2010-2012, second to reveal what factors caused the high or low quality of the thesis, third what steps should be taken so that quality of the thesis can increase time by time; and the last is whether there are elements of plagiarism in it, and the percentage of the level of plagiarism in it? To answer the above question, the researcher uses a qualitative research by collecting from the thesis existed by case study Approach.---Sebagai sebuah karya ilmiah, skripsi bukanlah sekedar merupakan syarat formalitas yang scara otomatis dapat mengantar mahasiswa ke jenjang kesarjanaan yang didamba-dambakan. Skripsi harus dipertahankan di depan sidang munaqasyah (sidang ujian skripsi), sebagai ujian peresmian pengujian kadar kualitas karya ilmiah yang dituis mahasiswa. Secara umum, penelitian ini bertujuan untuk menggambarkan kualitas keilmiahan skripsi yang dibuat mahasiswa jurusan/prodi bahasa dan sastra Arab tahun 2010-2012, dan secara khusus untuk mengungkapkan factor-faktor apa yang menyebabkan tinggi atau rendahnya kualitas skripsi, langkah-langkah apa yang harus ditempuh agar skripsi mahasiswa berkualitas, dan apakah ada unsur plagiat di dalamnya, serta sejauh mana tingkat plagiatisme tersebut? Untuk menjawab pertanyaan di atas, peneliti menggunakan jenis penelitian kualitatif meskipun data-data dikumpulkan secara kuantitatif. Pendekatan yang dilakukan adalah pendekatan studi kasus (case-studies).