Abstract
In our daily life, many common items are simply linkages or application of linkage, especially the folding objects like folding umbrellas or folding chairs. In first four sections, we would state in detail how to use Cabri 3D to simulate real umbrella, folding umbrella, and folding chair by simple linkages. In the last three sections, we would construct Theo Jansen’s mechanism and Klann’s linkage which are linkages simulating the gait of legged animal.