  The reduction of the \emph{K2}'s Campaign 9 (K2C9) microlensing data is
challenging mostly because of the very crowded field and the unstable pointing
of the spacecraft. In this work, we present the first method that can extract
microlensing signals from this K2C9 data product. The raw light curves and the
astrometric solutions are first derived, using the techniques from
Soares-Furtado et al. and Huang et al. for \emph{K2} dense field photometry. We
then minimize and remove the systematic effect by performing simultaneous
modeling with the microlensing signal. We also derive precise $(K_p-I)$ vs.
$(V-I)$ color-color relations that can predict the microlensing source flux in
the \emph{Kepler} bandpass. By implementing the color-color relation in the
light curve modeling, we show that the microlensing parameters can be better
constrained. In the end, we use two example microlensing events,
OGLE-2016-BLG-0980 and OGLE-2016-BLG-0940, to test our method.
