Combining x-ray diffraction and high pressure Mössbauer spectroscopy, the structure and the hyperfine parameters of Sn substituted for Fe in γ'-Fe₄N were in-vestigated. The results of x-ray diffraction indicate that single phase γ'-(Fe_1-xSn_x)₄N compounds can be synthesized in the composition range 0≤x≤0.3, and the lattice parameter can be well fitted with two linear formulas α₀(x) = 3.795+0.019×x (0.0≤x≤0.10) and α₀(x)=3.795 + 0.228 × (x-0.1)(0.10≤x≤0.30) for different content of Sn. Using high pressure Mössbauer spectra, the influences of the magnetovolume effect and the chemical bonding effect of Sn atom on the hyperfine magnetic field and the isomer shift were first distinguished. It is found that the magnetovolume and the chemical bonding have different influences on the properties of γ'-(Fe_1-xSn_x)₄N. and the latter plays a more important role.