  In a recent Rapid Communication (Phys. Rev. B {\bf 63}, 121210(R) (2001)),
Ha\"usler showed that the interaction between electrons in quantum wires may
enhance the persistent spin current arising from Rashba spin-orbital coupling.
In this Comments, we would like to point out that this 'enhancement' comes from
a misunderstanding to the boosting persistent current in the Luttinger liquid
theory. A correct calculation will not give such an enhancement of the
persistent spin current. Meanwhile, we provide a Luttinger liquid theory with
Rashba spin-orbital interaction by bosonization, which may show how the Rashba
precession is in a Luttinger liquid.
