After examining the result of the preliminary experiment, three kinds of circuit were chosen to be basic, and several items were given to be remembered. There items were called 'K' items. Preliminary test was administered to find out pupil's ability of handling computation of the circuits. The instructor explained 'K' items of basic circuit to the pupils and asked them to memorize them. Then the retention was tested by means of reproduction method. Followint to this, subjects were asked to solve the problem and the results were fed back to them. The same kind test with the preliminary test was given to the learners after the drill to see how the ability of computation improved. It was found that the programmed instruction helped effective learning.