The TbFe6-xGa6+x compounds (x=0，0.5，1.0 and 1.45)have been prepared and studied by X-ray powder diffraction and magnetization measurements．The structure of the compound TbFe6-xGa6+x transfers from the orthorhombic ScFe6Ga6-type structure(space group Immm)(x=0 and 0.5)to the tetragonal ThMn12type structure(space group 14/mmm)(x=1.0 and 1.5)and the volume of the unit cell increases as Ga content increases．The lattice parameters are a=0.85550.b=0.8626 and C =0.50717 nm for TbFe6Ga6，and a=0.86672，and c=0.50900 nm for TbFe4.55Ga7.45.The magnetization measurements indicate all the TbFe6-xGa6+x compounds have magnetic ordering．The Curie temperatures decrease from 492 K for TbFe6Ga6 to 327 K for TbFe4.55Ga7.45 The magnetization of the TbFe6-xGa6+x decreases with temperature due to the mutually compensating effect of the R-and Fe-sublattice magnetizations below its magnetic ordering temperature．
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