  Two-component Bose condensates with repulsive interaction are stable when
$g_{\rm \scriptscriptstyle 1} g_{\rm \scriptscriptstyle 2}<g_{\rm
\scriptscriptstyle 12}^{2}$ is satisfied. By tuning the interactions, we show
that the instability corresponding to bose-bose phase separation always happens
at a higher temperature than corresponding to bose-fermi phase separation
happens. Moreover, we find both the transition temperature $T_{\rm
\scriptscriptstyle DW}$ of supersolid and the coherence peak at $k_{\rm
\scriptscriptstyle DW}$ are enhanced in the mixtures studied. These will make
the observation of supersolid in experiments more reachable.
