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The aims of the research were to: 1) find the efficiency of the Computer Assisted Instruction (CAI) based on the GCC concept in English subject for vocational students., 2) the results of pre and post achievement test of students learning from the CAI., and 3) find the satisfaction of vocational students taking the CAI. The subjects of this research were 30 vocational students taking English subjects in the first semester of the academic year 2017 at Saraburi Technical College. The research instruments were the CAI for vocational students, pre-test and post-test, and a satisfaction questionnaire. The statistics used for data analysis were percentage, mean, standard deviation, and t-test for a dependent sample. The result of the study showed that the CAI had an efficiency of 81.67/80.33. The achievement of the students before learning with the CAI for vocational students was 8.03, and the standard deviation value was 1.00. The average scores after learning with the CAI for vocational students were 24.50, and the standard deviation value was 2.75 t-test value between before and after learning was 16.47, and it was significantly different at the 0.05 level. The satisfaction of the vocational students toward the CAI was at a high level.