This study aims to construct the assessment system of computer-aided manufacturing technology 2D technique for students in a vocational school. The first step was to carry out literature review to develop the materials and assessment, and then, to do the expert review and reliability and validity test. Second, the system and materials were modified to make sure the feasibility of the assessment method. Third, the pilot experiment teaching was conducted. Based on the experimental results, the assessment tool was amended to provide teaching materials and assessment system for evaluation in formal experiments.