  We first study the escape probability of the spinning particle emitted from
the Kerr black hole and find that the escape probability increases with the
spin of the particle around the extreme Kerr black hole; in contrast, the
escape probability decreases at the position near the horizon but increases at
the position far away from the horizon with the increasing spin of the
particle. We then probe the relation between the escape probabilities and the
energy extraction efficiencies of collisional Penrose processes for the
particles with varying spin. For the extreme Kerr black hole, the efficiency
increases with the escape probability; for the non-extreme Kerr black hole, the
near-horizon-efficiency decreases with the escape probability whilst the
efficiency may increase with the escape probability in the ergosphere. In the
event horizon limit, we also find that the average escape probability of the
spinning particle produced in the collisional Penrose process decreases with
the rotation parameter of the Kerr black hole.
