A well-educated and qualified workforce is one of the most important outputs in vocational and technical education. Vocational schools constitute the last circle in Turkey for the preparing students about the vocational and technical education in order to meet the need for the intermediate staff needed by the labor market. The educational model which called 3 + 1, allows the period of training to be carried out in enterprises in order to make up for the students lack practice and skills in the vocational schools which criticized for lack of internship period and ineffectiveness. The purpose of this research is the student perspective analysis of the contribution to student's professional knowledge of job training (internship) in the 3 + 1 education model. This research was conducted on 234 students with 6 hypotheses. According to the results of the research, some variables are significant differences in the occupational contribution from the model. These variables are the program being studied, the monthly spending level of the student, the attitude developed against the vocational higher school and the place where the student lives. Gender of the student and academic achievement do not have significant effects on the professional contribution.