  We study the optical appearance of a thin accretion disk around a
Schwarzschild black hole pierced by a cosmic string with a semi-analytic method
of Luminet [11]. Direct and secondary images with different parameters observed
by a distant observer is plotted. The cosmic string parameter s can modify the
shape and size of the thin disk image. We calculate and plot the distribution
of both redshift and observed flux as seen by distant observers at different
inclination angles. Those distributions are dependent on the inclination angel
of the observer and cosmic parameter s.
