  Here, we study the microlensing of radially pulsating stars. Discerning and
characterizing the properties of distant, faint pulsating stars is achievable
through high-cadence microlensing observations. Combining stellar variability
period with microlensing gives the source distance, type, and radius and helps
better determine the lens parameters. Considering periodically variations in
their radius and surface temperature, their microlensing light curves are
resulted from multiplication of the magnification factor with variable finite
size effect by the intrinsic brightness curves of pulsing source. The variable
finite source size due to pulsation can be significant for transit and single
microlensing and while caustic-crossing features. This kind of deviation in the
magnification factor is considerable when the ratio of the source radius to the
projected lens-source distance is in the range of $\rho_{\star}/u \in[0.4,10]$
and its duration is short and in the same order of the time of crossing the
source radius. Other deviations due to variable source intensity and its area
make colored and periodic deviations which are asymmetric with respect to the
signs of pulsation phase. The positive phases makes deviations with larger
amplitude that negative phase. These deviations dominate in filters with short
wave lengths (e.g., $B-$band). The position of magnification peaks in
microlensing of variable stars varies and this displacement differs in
different filters.
