The purpose of this research was to construct the efficiency of the Computer Assisted Instruction Package for Computer Instructional Package for Drawing 2 Dimension Subject for students in Vocational Certificate Education Level using subject by evaluating the efficiency of the Computer Assisted Instruction Package of the Students to the Computer Assisted Instruction Package for Drawing 2 Dimension Subject with the tools. The sample group was 30 students of Machine Shop Department in Vocational Certificate Education Level Pathumtani Technical College. Analysis by Index of Consistency Level of Difficulty Discrimination Power Average and Computer program. The result of this research was the efficiency 81.14/82.50 higher than the rule of 80/80. This could be concluded that the computer self study packagefor Drawing 2 Dimension Subject using can be used as a learning package efficiently.