  We propose to observe the top spin correlation effect at Tevatron through the
measurement of the correlated asymmetries of the charged lepton momenta using
the dilepton decay events of top and anti-top quark pairs. The possibility of
reconstructing the events and observing the asymmetries at 3$\sigma$ level with
projected luminosity of the Tevatron for Run II is demonstrated by simulation.
The effect can provide the first direct measurement of the spin of a quark.
