  In this work, the mass and pole residue of resonance $Y_b$ is studied by
using QCD sum rules approach at finite temperature. Resonance $Y_b$ is
described by a diquark-antidiquark tetraquark current, and contributions to
operator product expansion are calculated by including QCD condensates up to
dimension six. Temperature dependences of the mass $m_{Y_b}$ and the pole
residue $\lambda_{Y_b}$ are investigated. It is seen that near a critical
temperature $(T_c\simeq190~\mathrm{MeV})$, the values of $m_{Y_b}$ and
$\lambda_{Y_b}$ are decreased to $87\%$, and to $44\%$ of their values at
vacuum.
