Abstract: A stepping exerciser step plates link motion mechanism for forcing the two step plates of a stepping exerciser to smoothly efficiently oscillate back and forth at two opposite sides of a base plate during stepping exercises, comprising a lever pivotably secured to a mounting plate at the bottom of the base plate; two holder plates fixedly secured to the two step plates; a first pair of axles respectively rotatably fastened in the two holder plates; a second pair of axles respectively rotatably fastened in the two opposite ends of the lever and disposed in parallel with the first pair of axles, two flat rocker arms pivotably connected between the first and second pair of axles to link up the lever with the two step plates.