  We report extensive photometry of the dwarf nova KS UMa throughout its 2003
superoutburst till quiescence. During the superoutburst the star displayed
clear superhumps with a mean period of Psh = 0.070092(23) days. In the middle
stage of superoutburst the period was increasing with a rate of $\dot P/P =
(21\pm12)\times 10^{-5}$ and later was decreasing with a rate of $\dot P/P =
-(21\pm8)\times 10^{-5}$.
  At the end of superoutburst and during first dozen days of quiescence the
star was showing late superhumps with a mean period of Plate = 0.06926(2) days.
This phenomenon was observed even 30 days after beginning of the superoutburst.
  In quiescence the star shows quasi-periodic modulations with amplitude
reaching 0.5 mag. The most common structure observed during this stage was
sinusoidal wave characterized by a period of about 0.1 days.
  Comparing KS UMa to other SU UMa stars we conclude that this group of dwarf
novae shows decreasing superhump periods at the beginning and the end of
superoutburst but increasing period in the middle phase.
