  The Wide Field Survey Telescope (WFST) is a dedicated time-domain multi-band
($u$, $g$, $r$, $i$, and $z$) photometric survey facility under construction.
In this paper, we present a preliminary study that assesses the quality of
photometric redshifts based on WFST by utilizing mock observations derived with
the galaxy catalog in the COSMOS/UltraVISTA field. We apply the template
fitting technique to estimate photometric redshifts by using the ZEBRA
photometric-redshift code and adopting a modified set of adaptive templates. We
evaluate the bias (median relative offset between the output photometric
redshifts and input redshifts), normalized median absolute deviation
($\sigma_{\rm NMAD}$) and outlier fraction ($f_{\rm outlier}$) of photometric
redshifts in two typical WFST observational cases, the single 30-second
exposure observations (hereafter shallow mode) and co-added 50-minute exposure
observations (hereafter deep mode). We find bias$\la0.006$, $\sigma_{\rm
NMAD}\la0.03$, and $f_{\rm outlier}\la5\%$ in the shallow mode and bias$\approx
0.005$, $\sigma_{\rm NMAD}\approx 0.06$, and $f_{\rm outlier}\approx
17\%$--$27\%$ in the deep mode, respectively, under various lunar phases.
Combining the WFST mock observational data with that from the upcoming CSST and
Euclid surveys, we demonstrate that the $z_{\rm phot}$ results can be
significantly improved, with $f_{\rm outlier}\approx 1\%$ and $\sigma_{\rm
NMAD}\approx 0.02$.
