The temperature tuning of ${\mathbf{BaGa}}_{\mathbf{4}}{\mathbf{Se}}_{\mathbf{7}}$ (BGSe) was demonstrated for the first time, to the best of our knowledge. When the temperature of BGSe (56.3°,0°) was raised from 30°C to 140°C, the idler light under type I raised from 3637 nm to 3989 nm, the tunable range reached 352 nm, and $\mathrm{\Delta }{\lambda }_2/\mathrm{\Delta }\mathrm{T}$ reached 3.20 nm/°C. We calculated the phase matching curve of BGSe when $?$ and $\mathrm{T}$ took different values. The relationship between $\theta$ and $\mathrm{\Delta }{\lambda }_2/\mathrm{\Delta }\mathrm{T}$ was obtained by fixing $?$ at 0°. The maximum $\mathrm{\Delta }{\lambda }_2/\mathrm{\Delta }\mathrm{T}$ and its corresponding ($\theta ,?$) phase matching type were reported under different fixed ${\lambda }_2(3\mathrm{\mu m},3.2\mathrm{\mu m},\dots ,5\mathrm{\mu m})$.