Abstract: Projection analysis and configuration design of assembly constitute one of the essential
contents in engineering graphics course. It lays foundation for engineers to read technical drawings,
and design details of geometric structures of machine parts. For this purpose, a series of example are
shown based on isosceles triangles, isosceles right triangles, squares, circles, and combinations of
squares as two-sided projection. And spatial divergence conception is worked out by means of
line-surface and shape-volume analysis of basic units as prism, pyramid, cylinder, cone, sphere and
torus. In result, assembly of various geometric shapes and the third projection are derived. 3D
geometric models are implemented using CATIA software. It strengthens the ability of spatial
ideation, provides fundamental samples for geometric configuration design, and enhances logicality
and interestingness in the process of projection analysis.

Key words: combination solid, projection analysis, configuration design, spatial ideation, CATIA