This CAD is a software developed for an experiment or an exercise of the logical circuit in the university education and is a system that consists of a personal computer, a display device, a printer, a mouse (pointing device) and elements. It can easily and free to draw up a circuit figure on the display. The number of circuits composed by CAD comes up to more than one mill ion. The logical working of the designed circuit is displayed and expressed by a truth table and the logical equation. The expression of the table is done by the output of each logical element. Results and analysis of the questionnaires from students (users) are reported in this paper.