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Manifestations of activity on the YZ CMi (M4.5Ve) flare star which has arotation period of 2.77 days and belongs to a group of activity-saturatedstars, are considered from long-term photometric data together withphotographic measurements from 1926 to 2009. Long-term changes in yearly meanbrightness of the star are found on a time scale of 27.5 years with anamplitude of $0.2 - 0.3^m$ that indicate variations in development of surfaceinhomogeneities and a large degree of surface spottedness in the maximumactivity.  Spots are distributed unevenly over the surface, their concentration ishigher at certain longitudes spaced by intervals equal to 0.6 phases of therotation period. The recovery of active longitude (a possible "flip-flop"effect) occurs over a period of about 6 years. We note differences in activityof this star from typical for the Sun and solar-like stars, which areassociated with its dynamic characteristics $P_{cyc}$ and $P_{rot}$ and itsinner structure.

Long-Term Cyclic Variability of YZ CMi in the Context of Solar and Stellar Physics