  We present the results of a three-year photometric study of the $\delta$
Scuti star UV Trianguli. Our data sets consist of 9378 differential
measurements in Johnson V together with a few data collected into the
Str\"{o}mgren {\em uvby$\beta$} system. UV Tri is at least a biperiodic
variable. The two best-fitting frequencies, $f_1$=9.3298 d$^{-1}$ and
$f_2$=10.8513 d$^{-1}$, are still not the complete set of pulsation frequencies
representing the star's light variations. A suspected third frequency might
present in the star. Several ``anomalous cycles'' are observed in the light
curves. They seem real, but are aperiodic. We derive the colour indices and
physical parameters for the variable and conclude that it is a Population I
$\delta$ Sct star with normal metal abundance ([Me/H]=0.0$\pm$n0.1 dex)
evolving on its main sequence stage at an early evolutionary phase before the
turn-off point. Finally, we compare the observed oscillation frequencies with
theoretical models. The two pulsation modes of UV Tri are likely nonradial to
be gravity modes.
