  The results established by Flandoli, Gubinelli and Priola ({\it Invent.
Math.} {\bf 180} (2010) 1--53) for stochastic transport equation with bounded
and H\"{o}lder continuous drift are generalized to bounded and Dini continuous
drift. The uniqueness of $L^\infty$-solutions is established by the
It\^o--Tanaka trick partially solving the uniqueness problem, which is still
open, for stochastic transport equation with only bounded measurable drift.
Moreover the existence and uniqueness of stochastic diffeomorphisms flows for a
stochastic differential equation with bounded and Dini continuous drift is
obtained.
