  We numerically investigate some properties of unbalanced St\"{u}ckelberg
holographic superconductors, by considering backreaction effects of fields on
the background geometry. More precisely, we study the impacts of the chemical
potential mismatch and St\"{u}ckelberg mechanism on the condensation and
conductivity types (electrical, spin, mixed, thermo-electric, thermo-spin and
thermal conductivity). Our results show that the St\"{u}ckelberg's model
parameters $C_{\alpha}$ and $\alpha$ not only have significant impacts on the
phase transition, but also affect the conductivity pseudo-gap and the strength
of conductivity fluctuations. Moreover, the effects of these parameters on a
system will be gradually reduced as the imbalance grows. We also find that the
influence of $\alpha$ on the amplitude of conductivity fluctuations depends on
the magnitude of the both $C_{\alpha}$ and $\delta\mu/\mu$ in the electric and
thermal conductivity cases. This results in that increasing $\alpha$ can damp
the conductivity fluctuations of an unbalanced system in contrast to balanced
ones.
