  We report the photometric analysis of SU UMa based on the observations of the
Transiting Exoplanet Survey Satellite (TESS). TESS has released a large amount
of data, which contains the light curves of a complete superoutburst and three
normal outbursts of SU UMa. Based on the observations, the evolution of
superhumps during the superoutburst was analyzed. By using the O - C method,
the three stages were determined, and the superhump period for each stage was
calculated. The mass ratio $q=0.137 (1)$ was estimated based on the stage A
superhump method. A periodic oscillation with a period of 2.17(9) days was
found in the superhump minimum O - C diagram, which is related to the
precession of the accretion disk. We investigated the frequency information of
quasiperiodic oscillations (QPOs) in the light curves. An ultralong period QPO
of 0.18 days at the time of normal outburst and two ultralong periods QPOs of
0.19 days and 0.285 days in quiescence were found. No QPO was found in the
superoutburst.
