  Aiming at providing an objective motion picture for the microscopic object
described by the wave function, new analysis about motion is presented by use
of the point set theory in mathematics, through which we show that a new kind
of motion named quantum discontinuous motion is the general motion mode of the
particle, while classical continuous motion is just one kind of extremely
peculiar motion, and the wave function in quantum mechanics proves to be the
very mathematical complex describing the particle undergoing the quantum
discontinuous motion. Furthermore, Schroedinger equation of the wave function
is shown to be the simplest nonrelativistic evolution equation for the particle
undergoing the new motion, and the consistent axiom system of quantum mechanics
is also deduced out. At last, we demonstrate that present quantum measurement
theories just confirm the existence of the new motion of the microscopic
particle described by the wave function, and the weird displays of the wave
function in microscopic world are also physically explained in terms of the new
motion.
