Abstract: For the visual demonstration teaching aids in descriptive geometry develop slowly, a new
comprehensive demonstration teaching aid is developed by using rotating mechanism, slider-guide
institutions, double slider-rocker mechanism and the single chip microcomputer control. It
implements the integration operation demonstration such as the show of projection features and
typical examples in the descriptive geometry. By solving the problems of the line, line-surface and
method of conversion surface, it has carried on the shows of specific examples. The shows provide
the application of this teaching aid. It not only helps teachers teaching, but also helps students
independent learning and uses as teaching resource. The teaching aid can be widely used in
descriptive geometry.

Key words: engineering drawing, descriptive geometry, demonstration teaching aids, single-chip
microcomputer