ABSTRACTThe purpose of this study was to assess whether or not students and teachers were having positive attitude towards the practice of content based language instruction and to see the actual practice of it in TVET poly technic colleges. It was particularly meant to investigate students’ attitude towards the usefulness of the course, course contents, assessment and teacher’s competence. Teacher’s attitude towards the course and challenges of it if occurs were investigated. Moreover, the study was targeted to investigating the actual practice of teaching in three areas: students’ participation, teachers’ language skills and teachers’ skill in using instructional materials. The study was conducted in one Polytechnic College of Amhara Region. Generally, from the total number of 2909 trainees in four different levels; second year Level Three and Level Four trainees were purposefully selected. From the selected six departments (639 trainees), 185 were randomly selected. Regarding CBL teachers, no sample selection were needed for their number was small and easily manageable. So, the participant of the study were 6 teachers and 185 students in the college. The data were collected through questionnaire, observation and interview and the results were analyzed quantitatively and qualitatively. The result of the study revealed that students and teachers showed positive attitude towards the usefulness of CBL courses, course contents and course assessment. However, students had negative attitude towards teachers’ competence. And teachers’ actual practice revealed that teachers did not properly apply content based language instruction to bring the desired result. The study also indicated that there were problems for its implementation due to teachers’ lack of language skills and training. The combined responses of the participants (students and teachers) revealed that the students didn’t get benefit and this impact developed because of teachers’ incompetence to implement content based language instruction. Finally, it was concluded that CBLI was not implemented as it is desired. Therefore, concerned bodies should take various measures to ameliorate the challenges.