  The most precise measurement of the $CP$ asymmetry in the decay
$B^-\rightarrow D_s^-D^0$ has been reported by LHCb collaboration with the
value of $(-0.4\pm0.5\pm0.5)\%$. In this study, the $CP$ violation in the decay
$B^-\rightarrow D_s^-D^0$ has been calculated under the factorization approach.
This decay mode includes current-current tree and penguin diagrams and their
amplitudes are considered separately. In each of the tree and penguin
amplitudes, the strong and weak phases have been introduced. The $CP$ asymmetry
has been calculated in this work to be $(-0.35\pm0.03)\%$. Finally, from the
sum of the amplitudes, we have calculated the total amplitude and obtained
comparable results with experimental value for the branching ratio of
$B^-\rightarrow D_s^-D^0$ decay.
